YLDP09YL offline in app and cannot automate

Since yesterday my 3 YLDP09YL that were working perfectly with Mi AI speaker as BLE gateway have stopped operating. Since then i have deleted the lamps and added them once again now i cannot form them as a group as they show as being offline.
As per the above i am not able to utilize them as smart anymore.
I am on China mainland server.
@dingyichen Andy any suggestions what could be the issue? Is it the server?
In yeelight app they show also as offline and no matter how many times i press the switch button they go offline…