ent.
@param visitor_data: visitor data.
@param data_sync_id: data sync ID.
@param session_index: session index.
@param player_url: player URL.
@param video_id: video ID.
@param kwargs: Additional arguments to pass down. May be more added in the future.
@return: The fetched PO Token. None if it could not be fetched.
z!Unable to fetch GVS PO Token for zz client: Missing required Visitor Data. You may need to pass Visitor Data with --extractor-args "youtube:visitor_data=XXX"Nz$Unable to fetch Player PO Token for z" client: Missing required Video IDz