Android Roon Remote not connecting to Mac core

Hello to all

i recently replaced my Nuc ROCK as a core with my Mac mini M1. I have completed the migration etc and all works ok. All my other remotes (ipad and android tablet) can successfully communicate with the core except for my android phone (xiaomi x5 pro 5g). I am running 2.0 in both. i also tried using legacy 1.8 but the same occurs…

The mac mini core is connected via ethernet cable.

I tried reinstalling the app many times. No success. Only a fewe times the remote did actually connect but then it looses the connection and “searches” for core…

Any ideas?