WiFi HTTP(s) requests are not sent (Enduro 3)

Hi!

My app sends HTTPS requests using WiFi if no Bluetooth connection is available. This works well, except for one user with Enduro 3. He gets a sync completed successfully message, but no request seems to reach his server. In the simulator with my server it works fine. The user also tried a different watch (vivoactive 3) and it worked as well. So my guess is that something must be implemented differently inside the connectIQ libs on Enduro 3. Any ideas what could cause this issue? How could I debug this?

regards,

Christian