- Disconnect from the Pacer app
- Reconnect while noting the used email address
- Go to this link
- Log in with the same Pacer email address
- Then disable and re-enable the Garmin or Coros sync!
- Garmin: Do the same on this link
- Coros: Go to the Coros app and profile > third-party app settings > decathlon > sync
If it still doesn't sync on your next workout, please fill out this form, indicating that your Garmin activity is not appearing on the Decathlon HUB apps.
Note that this process will not display your past sessions; it will only work for future ones.
Even when properly connected, it's not possible to restart automatic Garmin sync. However, using a computer, you can transfer Garmin GPX files to this link, and that should work ;)