Actually I've already posted it here:
But my run this morning did not synchronized and Garmin Connect is returning an error message when I try to upload the fit file (FIT file was uploaded with no issues to Strava and Runalyze so should be okay).
The 2 activities I did after (a walk and some strengthening) synchronized without any issues as did all my yesterday activities (including 2 runs).
Kind regards
Sergio