diff --git a/SAS/TMSS/backend/services/scheduling/lib/dynamic_scheduling.py b/SAS/TMSS/backend/services/scheduling/lib/dynamic_scheduling.py
index bff71d033ab4c13f79bf42430a3604e13236ecea..9967108abc915d19ef43b2a5a55380a715bd4c23 100644
--- a/SAS/TMSS/backend/services/scheduling/lib/dynamic_scheduling.py
+++ b/SAS/TMSS/backend/services/scheduling/lib/dynamic_scheduling.py
@@ -643,7 +643,7 @@ class Scheduler:
                         task_center_time, transit_time, offset_to_transit, lowest_elevation, elevation_at_center, elevation_at_transit = get_timestamps_elevations_and_offset_to_transit(unit, unit.scheduled_start_time)
 
                         logger.log(log_level,
-                            "  id=% 4d queue=%s name=%s start_time='%s'[UTC]  duration=% 3d[min]  status=%s  centralLST='%s'  transit_offset=% 5d[min]  elv@transit=% 3.1f[deg]  elv@center=% 3.1f[deg]  elv_lowest=% 3.1f[deg]",
+                            "  id=% 4d queue=%s name=%s start_time='%s'[UTC]  duration=% 4d[min]  status=%s  centralLST='%s'  transit_offset=% 5d[min]  elv@transit=% 3.1f[deg]  elv@center=% 3.1f[deg]  elv_lowest=% 3.1f[deg]",
                             unit.id,
                             unit.priority_queue.value,
                             ("'%s'" % (unit.name[:32],)).ljust(34),
diff --git a/SAS/TMSS/backend/services/scheduling/test/t_dynamic_scheduling.py b/SAS/TMSS/backend/services/scheduling/test/t_dynamic_scheduling.py
index cd9364b1b8db70dbe420ca24b511f5e0e5b94ff7..b40ae6581fd4ecdca4a72a9cae1fdd0392a75f06 100755
--- a/SAS/TMSS/backend/services/scheduling/test/t_dynamic_scheduling.py
+++ b/SAS/TMSS/backend/services/scheduling/test/t_dynamic_scheduling.py
@@ -457,10 +457,160 @@ class TestFixedTimeScheduling(BaseDynamicSchedulingTestCase):
         self.assertEqual(models.SchedulingUnitStatus.Choices.SCHEDULED.value, scheduling_unit_blueprint.status.value)
         self.assertEqual(at, scheduling_unit_blueprint.scheduled_start_time)
 
+    def test_bug_fix_TMSS_2302_unschedulable_reason_too_generic(self):
+        """
+        Test to reproduce the reported bug that a fixed_time unit does not state a specific unschedulable reason.
+        See: https://support.astron.nl/jira/browse/TMSS-2302
+        We are using the specs from https://tmss.lofar.eu/schedulingunit/view/blueprint/2004 which had troubles being scheduled.
+        """
+        project = models.Project.objects.create(**Project_test_data(name=str(uuid.uuid4()), auto_ingest=True,
+                                                                    project_state=models.ProjectState.objects.get(value=models.ProjectState.Choices.ACTIVE.value)))
+
+        cycle = models.Cycle.objects.create(name=str(uuid.uuid4()),
+                                            start=datetime.utcnow()-timedelta(days=1),
+                                            stop=datetime.utcnow() + timedelta(days=7))
+        cycle.projects.set([project])
+        cycle.save()
+
+        scheduling_set = models.SchedulingSet.objects.create(**SchedulingSet_test_data(project=project))
+
+        at = datetime(2023, 3, 30, 18, 40)   #round_to_second_precision(datetime.utcnow() + timedelta(days=1))
+        strategy_template = models.SchedulingUnitObservingStrategyTemplate.get_latest(name="IM HBA LoTSS - 2 Beams")
+        su_draft = create_scheduling_unit_draft_from_observing_strategy_template(strategy_template, scheduling_set=scheduling_set,
+                                                                                 specifications_doc_overrides={
+                                                                                     "scheduling_constraints_doc": {
+                                                                                         "daily": {
+                                                                                             "avoid_twilight": False,
+                                                                                              "require_day": False,
+                                                                                              "require_night": False
+                                                                                            },
+                                                                                            "scheduler": "fixed_time",
+                                                                                            "sky": {
+                                                                                              "min_distance": {
+                                                                                                "jupiter": 0.2617993877991494,
+                                                                                                "moon": 0.3490658503988659,
+                                                                                                "sun": 0.5235987755982988
+                                                                                              },
+                                                                                              "min_elevation": {
+                                                                                                "calibrator": 0.5235987755982988,
+                                                                                                "target": 0.5235987755982988
+                                                                                              },
+                                                                                              "transit_offset": {
+                                                                                                "from": -3600,
+                                                                                                "to": 3600
+                                                                                              }
+                                                                                            },
+                                                                                            "time": {
+                                                                                              "at": at.isoformat()
+                                                                                            }
+                                                                                          },
+                                                                                          "tasks": {
+                                                                                            "Calibrator Observation 1": {
+                                                                                              "short_description": "Cal 3C196",
+                                                                                              "specifications_doc": {
+                                                                                                "calibrator": {
+                                                                                                  "pointing": {
+                                                                                                    "angle1": 2.1537413875046543,
+                                                                                                    "angle2": 0.8415517080119602,
+                                                                                                    "direction_type": "J2000",
+                                                                                                    "target": "3C196"
+                                                                                                  }
+                                                                                                }
+                                                                                              }
+                                                                                            },
+                                                                                            "Calibrator Observation 2": {
+                                                                                              "short_description": "Cal 3C295",
+                                                                                              "specifications_doc": {
+                                                                                                "calibrator": {
+                                                                                                  "pointing": {
+                                                                                                    "angle1": 3.714680167406339,
+                                                                                                    "angle2": 0.9111102054650467,
+                                                                                                    "direction_type": "J2000",
+                                                                                                    "target": "3C295"
+                                                                                                  }
+                                                                                                }
+                                                                                              }
+                                                                                            },
+                                                                                            "Calibrator Pipeline 1": {
+                                                                                              "short_description": "Cal1 3C196/PP"
+                                                                                            },
+                                                                                            "Calibrator Pipeline 2": {
+                                                                                              "short_description": "Cal2 3C295/PP"
+                                                                                            },
+                                                                                            "Pipeline target1": {
+                                                                                              "short_description": "COSMOS/TP"
+                                                                                            },
+                                                                                            "Pipeline target2": {
+                                                                                              "short_description": "P145+04/TP"
+                                                                                            },
+                                                                                            "Target Observation": {
+                                                                                              "short_description": "COSMOS_P145+04",
+                                                                                              "specifications_doc": {
+                                                                                                "duration": 14400,
+                                                                                                "station_configuration": {
+                                                                                                  "SAPs": [
+                                                                                                    {
+                                                                                                      "digital_pointing": {
+                                                                                                        "angle1": 2.620073728683454,
+                                                                                                        "angle2": 0.038499054416908256,
+                                                                                                        "direction_type": "J2000",
+                                                                                                        "target": "COSMOS"
+                                                                                                      }
+                                                                                                    },
+                                                                                                    {
+                                                                                                      "digital_pointing": {
+                                                                                                        "angle1": 2.5359372232089807,
+                                                                                                        "angle2": 0.07651038627062032,
+                                                                                                        "direction_type": "J2000",
+                                                                                                        "target": "P145+04"
+                                                                                                      }
+                                                                                                    }
+                                                                                                  ],
+                                                                                                    "station_groups": [
+                                                                                                        {
+                                                                                                            "max_nr_missing": 4,
+                                                                                                            "stations": [ "CS002", "CS003", "CS004", "CS005", "CS006", "CS007", "CS011", "CS013", "CS017", "CS021", "CS024", "CS026", "CS028", "CS030", "CS031", "CS032", "CS101", "CS103", "CS201", "CS301", "CS302", "CS401", "CS501", "RS106", "RS205", "RS208", "RS210", "RS305", "RS306", "RS307", "RS310", "RS406", "RS407", "RS409", "RS503", "RS508", "RS509"]
+                                                                                                        },
+                                                                                                        {
+                                                                                                            "max_nr_missing": 2,
+                                                                                                            "stations": ["DE601", "DE602", "DE603", "DE604", "DE605", "DE609", "FR606", "SE607", "UK608", "PL610", "PL611", "PL612", "IE613", "LV614"]
+                                                                                                        },
+                                                                                                        {
+                                                                                                            "max_nr_missing": 1,
+                                                                                                            "stations": ["DE601", "DE605"]
+                                                                                                        }
+                                                                                                    ],
+                                                                                                  "tile_beam": {
+                                                                                                    "angle1": 2.578006639499052,
+                                                                                                    "angle2": 0.05750510819470917,
+                                                                                                    "direction_type": "J2000",
+                                                                                                    "target": "COSMOSP145+04REF"
+                                                                                                  }
+                                                                                                }
+                                                                                              }
+                                                                                            }
+                                                                                          }
+                                                                                        })
+        scheduling_unit_blueprint = create_scheduling_unit_blueprint_and_tasks_and_subtasks_from_scheduling_unit_draft(su_draft)
+
+        # assert blueprint has correct constraints, and is schedulable
+        self.assertEqual('fixed_time', scheduling_unit_blueprint.scheduling_constraints_doc['scheduler'])
+        self.assertEqual(at.isoformat(), scheduling_unit_blueprint.scheduling_constraints_doc['time']['at'])
+        self.assertEqual(scheduling_unit_blueprint.status.value, models.SchedulingUnitStatus.Choices.SCHEDULABLE.value)
+
+        self.scheduler.schedule_fixed_time_scheduling_units()
+
+        # Assert the scheduling_unit is unschedulable, and has a specific unschedulable_reason
+        scheduling_unit_blueprint.refresh_from_db()
+        self.assertEqual(models.SchedulingUnitStatus.Choices.UNSCHEDULABLE.value, scheduling_unit_blueprint.status.value)
 
+        # the bug yields a generic reason: constraint time.at='2023-03-30 18:40:00' falls outside of window ['2023-03-30 18:40:00', '2023-03-30 22:40:00']
+        # but the root cause of unschedulability is: "sky.min_elevation  is not met at evaluation='2023-03-30 19:00:00'"
+        # we want to see that message in the unschedulable_reason, which is currently not the case.
+        self.assertNotIn('falls outside of window', scheduling_unit_blueprint.unschedulable_reason)
 
 
-    def test_excetion_during_scheduling_sets_state_to_unschedulable(self):
+    def test_exception_during_scheduling_sets_state_to_unschedulable(self):
         """
         Test a simple observation with the 'at' constraint and 'fixed_time' scheduler.
         When an exception is raised during scheduling, the state should go to unschedulable so the user can retry/fix.
@@ -3224,8 +3374,8 @@ class TestTriggers(BaseDynamicSchedulingTestCase):
 logging.basicConfig(format='%(asctime)s %(levelname)s %(message)s', level=logging.INFO)
 
 # # uncomment to show debug messages for scheduling modules
-# logging.getLogger('lofar.sas.tmss.services.scheduling').level = logging.DEBUG
-# logging.getLogger('lofar.sas.tmss.tmss.tmssapp.subtasks').level = logging.DEBUG
+logging.getLogger('lofar.sas.tmss.services.scheduling').level = logging.DEBUG
+logging.getLogger('lofar.sas.tmss.tmss.tmssapp.subtasks').level = logging.DEBUG
 
 # hide spam of postgreslistener messages
 logging.getLogger('lofar.sas.tmss.services.tmss_postgres_listener').disabled = True