Add warning during playback if Plex token missing (#51853)

homeassistant/components/plex/media_player.py

@@ -492,6 +492,10 @@ class PlexMediaPlayer(MediaPlayerEntity):
                 "Client is not currently accepting playback controls: %s", self.name
             )
             return
+        if not self.plex_server.has_token:
+            _LOGGER.warning(
+                "Plex integration configured without a token, playback may fail"
+            )
 
         src = json.loads(media_id)
         if isinstance(src, int):

homeassistant/components/plex/server.py

@@ -537,6 +537,11 @@ class PlexServer:
         """Return the plexapi PlexServer instance."""
         return self._plex_server
 
+    @property
+    def has_token(self):
+        """Return if a token is used to connect to this Plex server."""
+        return self._token is not None
+
     @property
     def accounts(self):
         """Return accounts associated with the Plex server."""