No response from yeelight lamps (Europe server)

In Google home it shows me I have 4 units linked but they do not respond when I try to shut off the lights. They just tell me “no response”.

This started this weekend.
I am on wifi. Nothing has changed since last. It also shows me in Google home that I am linked to yeelight.

When I open my yeelight app and log in there are no devices added at all. Not sure why they disappeared.

Please help.

My account is: 6181133279