Hello,
After reinstalling the CMF app and reconnecting the watch, I was able to automatically synchronize 2 from 3 activities (run).
I contacted the CMF support and got this as a response:
"At this point, what we’re going to do is to escalate this to the respective team for further
diagnostic and what will be their advice for these. "
It will be much easier if they implement simple manual upload to Strava. For example selecting activity in the CMF app and sending it to Strava using a dedicated menu item or button in the UI.