Since Thursday the app doesn't show my personal activities even if watch and smartphone are correctly connected. It's your problem: are you doing something?
It's your problem: are you doing something?
This is for the most part a user-to-user forum. We can try to help you here, but if you wish to communicate with Garmin, best to do so starting at the Garmin Support Center. From there you can either call, chat, or email to get assistance.
Meanwhile, I would have a look at the Sync / Connection Troubleshooting Guide, which is pinned to the top of this forum. Not knowing details on your issue, look at #7, especially if the device shows as connected, yet you are not seeing your activities.