The first phase of connection I did and then, when trying to synchronize gave a synchronization error and remained in the state "connecting" as I have seen here:
http://www.gpsrchive.com/GPSMAP/GPSMAP% ... ssues.html
After doing all kinds of tests (which I also saw here viewtopic.php?f) I didn't get.4. Frequently, the Bluetooth Setup Status will display 'Connecting...'. indefinitely, requiring the user to either A. Open the Garmin Connect application on the paired Android Device to complete the connection, or B. Delete both devices from each other and repeat the pairing process as new.      
In the end, I got it with a previous version of Connect Mobile, specifically with the 4.21 July 2019, I downloaded it from here: https://www.apkmirror.com/apk/garmin/ga ... 2-release/ (it's a reliable site in terms of security, but obviously not a direct download of Garmin)
Is APK Mirror reliable? https://www.reddit.com/r/AndroidQuestio ... 6xro8u/how Thread in Reddit
I hope it helps and that Garmin corrects this bug in the next version of Connect Mobile.