Smartphone messages not compatible

mobile: Redmi note 8 (Xiaomi) 2019, Android 9 (pie)
Browser: TOMTOM GO 620 wifi

the Nav. fails to establish a bluetooth connection with the app relative to the notification of messages from the smartphone, it always results incompatible if I use the MYDRIVE app, but actually, I can connect to bluetooth only, without opening the app and with the data connection turned on, so I can manage to make hands-free calls.
I have tried to desynchronize in bluetooth the browser and the mobile in the browser by deleting it several times, I have realized that if after having associated them only via bt I want to use the app, I have to cancel it from the browser and start from zero in the app.
I understand that it is a problem due to the app (latest version).
Previously I had an old mobile phone, from 5 years ago and connecting without problems with all the functionalities, and no mess.

Can you help me with that please
Sincerely







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