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app/main.py

@@ -172,6 +172,7 @@ async def _join_room(room_id: str, token: str) -> None:
         await c.post(
             f"{CONDUIT}/_matrix/client/v3/join/{urllib.parse.quote(room_id)}",
             headers={"Authorization": f"Bearer {token}"},
+            json={},
         )