Setup: FR945 v4.10
Android 10.0.0 (Google Pixel 4XL), GCM 4.27.1
In GCM, tap on the upper left three-bar icon and from that list select Garmin Devices. Tap on the synchronise icon right to the FR945 and observe the output. Once synchronisation finishes, it shows a red exclamation mark and the text synchronisation failed. Afterwards the sync icon shows again. This happens every time you press synchronise.
Apart from that it seems all data was properly synchronised but still there seems to be something wrong once sync finishes.
Could anyone reproduce this behaviour? This might be some hint for Garmin to further investigate for people with sync issues or whose watches fail to sync properly.