mesh spotlights does not work with mesh hub

I’ve used four mesh LED spotlights for about 2 years.
But suddenly it stopped working from YESTERDAY.
The status reads as follows in the mesh hub :
“Not connected to Mesh gateway :
The mesh device needs to be used with Yeelight Smart Speaker or Xiaomi Xiaoai Smart Clock
Please go to YouPin to purchase”

I’ve used these for two years without any problem.
I’ve reset spotlights and tried to reconnect them but with the same result after pairing.

  • Mesh authorization(?) was failed during the pairing process with mesh hub.
    And they are all ‘offline’ after pairing.

What is going on?