{“type”:”error”,”message”:”failure to subscribe”}

when failure to subscribe , heartbeat channel return {“channel”:“subscriptions”,“client_id”:“”,“timestamp”:“2023-11-21T10:44:04.525665183Z”,“sequence_num”:0,“events”:[{“subscriptions”:{“heartbeats”:[“heartbeats”]}}]} without user id,
i find the 2023-11-21 7:00-8:00 always return “failure to subscribe” error, and work well at about 8:00 itself