@Brad_Olwin I already did that. On their side everything seems fine and works. As I said, all other apps/ services work like Strava, Garmin or Coros.
The strange thing is that the last 2 or 3 activities are in fact the latest and than all other activities are in the wrong order (so, 2-3 activities from 2023 and the next one from 2012 or so).
That’s why I thought it’s a bug in the app which sorts by the wrong time stamp.