GC won't display data in OnePlus Nord

A few days ago, I changed to a new Android phone (actually, my son's old OnePlus Nord) and I have a strange behavior from the Garmin Connect app.

In particular, when I sync my FR955, GC won't display any data (new and old, News Feed etc.). What I have found is that, if I uninstall and reinstall GC, all data is back there.

But, unfortunately, the next day, the same problem comes back again, so I have to go in the same process once more: uninstall and reinstall the app.

Since this cannot go on forever, does anyone have a clue on what is going on and what can be done to to fix this?

Thank you!