Millenium 55 android connectivity issues

I have problems using my Supreme Tournament 55 & Chess-Link in combination with Chess.com and my Android Phone (MIUI Global 13.0.12; Android version: 12 SKQ1.211006.001)
What works?
- The smartphone recognises the board via Bluetooth and a Bluetooth connection can be established.
- A connection to the Chess Link app can also be established and thus also the connection to Lichess in conjunction with a token.
What does not work?
The Chess.com app recognises the board and displays: "MILLENNIUM CHESS 34:81:F4:E8:80:E3). But when I then click on this found board, the following message appears at the bottom of the screen: "No connection could be established to the selected object."
I have already reinstalled the app, reset the smartphone to factory settings, etc. None of this has solved the problem so far.
Can anyone help me? That would be great.
Translated with DeepL.com (free version)