diff --git a/pytroll_collectors/scisys.py b/pytroll_collectors/scisys.py
index 528c1ea..406c96f 100755
--- a/pytroll_collectors/scisys.py
+++ b/pytroll_collectors/scisys.py
@@ -62,8 +62,8 @@
                       'jpss1': 'NOAA-20',
                       'noaa20': 'NOAA-20',
                       'noaa21': 'NOAA-21',
-                      'noaa21': 'NOAA-22',
-                      'noaa21': 'NOAA-23',
+                      'noaa22': 'NOAA-22',
+                      'noaa23': 'NOAA-23',
                       'j01': 'NOAA-20',
                       'j02': 'NOAA-21',
                       'j03': 'NOAA-22',
@@ -503,9 +503,19 @@ def stop(self):
         self.loop = False
 
 
+def update_sensor_tuple_or_list(to_send, config):
+    """Update sensor tuples and lists to multiple_sensors."""
+    to_send_dict = to_send.copy()
+    if "sensor" in to_send:
+        if isinstance(to_send["sensor"], list) or isinstance(to_send["sensor"], tuple):
+            to_send_dict["sensor"] = "multiple_sensors"
+    return to_send_dict
+
+
 def get_subject_from_message_and_config(to_send, config):
     """Get the publish topic from the message and the yaml configuration settings."""
-    return compose(config['publish_topic_pattern'], to_send)
+    to_send_dict = update_sensor_tuple_or_list(to_send, config)
+    return compose(config['publish_topic_pattern'], to_send_dict)
 
 
 def receive_from_zmq(config_filename,
diff --git a/pytroll_collectors/tests/test_scisys.py b/pytroll_collectors/tests/test_scisys.py
index 728a799..3635bfe 100644
--- a/pytroll_collectors/tests/test_scisys.py
+++ b/pytroll_collectors/tests/test_scisys.py
@@ -291,3 +291,21 @@ def test_create_message_topic_from_message_and_config_pattern(sensor, sensor_nam
     subject = get_subject_from_message_and_config(to_send, config)
 
     assert subject == topic_result
+
+
+def test_no_sensor_list_in_sending_topic():
+    """Test that a list of sensors is replaced with string multiple_sensors/."""
+    to_send = {'start_time': datetime.datetime(2024, 4, 23, 5, 34, 4),
+               'end_time': datetime.datetime(2024, 4, 23, 5, 39, 34),
+               'orbit_number': 78360,
+               'platform_name': 'NOAA-19',
+               'type': 'binary',
+               'format': 'HRPT',
+               'sensor': ('avhrr/3', 'mhs', 'amsu-a', 'hirs/4'),
+               'data_processing_level': '0',
+               'uid': '20240423053404_NOAA_19.hmf',
+               'uri': '/path/to/dummy/hrpt/20240423053404_NOAA_19.hmf',
+               'variant': 'DR'}
+    my_config = ({'publish_topic_pattern': "/{sensor}/{format}/TEST/"})
+    subject = get_subject_from_message_and_config(to_send, my_config)
+    assert subject == "/multiple_sensors/HRPT/TEST/"