Vivoative3: createSession - data sync trouble with Garmin Connect

Hi,

I'm trying to port my app Interval Running on vivoactive3, I succeed with almost everything (GPS calculation, pace,...screen design, memory management, sideswipe, screen, one pushbutton only) but I met a trouble with createSession.....all tools allowing to store in FiT file GPS position and other running data
My app operates very on vivoactive, vivoactive HR, FR230/235/630, I made NO modification on this code part (class) but nothing after a running session in the saved file probably, because after syncing with Garmin Connect, there is the aactivity reported but no data, no map.....

Is someone already met this trouble?

Thanks for your feedback
Sylvain