Add warning if Sonos not linked to Plex (#58150)

homeassistant/components/plex/services.py

@@ -2,7 +2,7 @@
 import json
 import logging
 
-from plexapi.exceptions import NotFound
+from plexapi.exceptions import BadRequest, NotFound
 import voluptuous as vol
 
 from homeassistant.exceptions import HomeAssistantError
@@ -133,7 +133,13 @@ def play_on_sonos(hass, content_type, content_id, speaker_name):
     Called by Sonos 'media_player.play_media' service.
     """
     media, plex_server = lookup_plex_media(hass, content_type, content_id)
+    try:
         sonos_speaker = plex_server.account.sonos_speaker(speaker_name)
+    except BadRequest as exc:
+        raise HomeAssistantError(
+            "Sonos speakers not linked to Plex account, complete this step in the Plex app"
+        ) from exc
+
     if sonos_speaker is None:
         message = f"Sonos speaker '{speaker_name}' is not associated with '{plex_server.friendly_name}'"
         _LOGGER.error(message)

tests/components/plex/test_services.py

@@ -154,6 +154,13 @@ async def test_sonos_play_media(
     await hass.config_entries.async_unload(entry.entry_id)
     mock_plex_server = await setup_plex_server()
 
+    # Test with unlinked Plex/Sonos accounts
+    requests_mock.get("https://sonos.plex.tv/resources", status_code=403)
+    with pytest.raises(HomeAssistantError) as excinfo:
+        play_on_sonos(hass, MEDIA_TYPE_MUSIC, media_content_id, sonos_speaker_name)
+    assert "Sonos speakers not linked to Plex account" in str(excinfo.value)
+    assert playback_mock.call_count == 0
+
     # Test with no speakers available
     requests_mock.get("https://sonos.plex.tv/resources", text=empty_payload)
     with pytest.raises(HomeAssistantError) as excinfo: