XIAOMI products stopped connecting to China mainland server

Hello all,

Since 15 days ago I have several of my Chinese devices (i lived in China for some years) as "offline" in my mihome app. However they are still perfectly connected to my WiFi.

I live in Europe and all has been working fine for 5+ years. Devices affected are my S2 roborock vacuum cleaner, my WiFi sockets, my Xiaomi gateway hubs.
Strangely my newer S5 roborock vacuum cleaner is still OK.

I tried removing and adding them in the app but even after connecting to the WiFi, not...

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