The association is successful, without any hitch and the clock works correctly until the first disconnection. After disconnecting by going out of Bluetooth range or after turning off Bluetooth, it no longer reconnects to the phone. If you make the association again it works regularly until a new disconnection.
I tried to pair two other Garmin watches to the same phone, but the problem still arises.
I tried to pair the Garmin Forerunner 55 watch with a Galaxy M31s and it works correctly (it always reconnects).
I made several attempts such as safe mode, verified that the App Connect was not deactivated if not used for a long time, I tried to work in safe mode, but nothing.
I also found a post from Samsung Community that seems to solve the problem with a dedicated patch, but I can't find the Galaxy M32 among the phones receiving the update: forums.garmin.com/.../1508141
I hope I was clear enough and remain available for any further clarifications.
Thanks to anyone who can help me