diff --git a/custom_components/nvidia_shield/media_player.py b/custom_components/nvidia_shield/media_player.py
index 83c5dec..480602f 100644
--- a/custom_components/nvidia_shield/media_player.py
+++ b/custom_components/nvidia_shield/media_player.py
@@ -825,7 +825,16 @@ class NvidiaShieldMediaPlayer(MediaPlayerEntity):
         }
     )
 
+    @property
     def extra_state_attributes(self) -> dict:
+        """Extra state attributes — a PROPERTY, as HA requires (t40 blocker).
+
+        ``Entity.__async_calculate_state`` merges them with
+        ``attr |= self.extra_state_attributes``; declaring this as a plain
+        method made every state write raise
+        ``TypeError: 'method' object is not iterable``, so the entity could
+        never render on a live install.
+        """
         # Now playing: prefer Jellyfin, fall back to ADB media session,
         # then the foreground tier (P3-3a).
         now_playing = self._get_now_playing()