Activity Not Syncing from Venu 4 to Garmin Connect

I’m experiencing an issue with my Garmin Venu 4.

  • The activity is available on my watch but hasn’t synced to Garmin Connect.

  • During the workout, the watch worked perfectly — no lags, power loss, or disruptions — and the session was successfully saved.

  • I can open and view the activity on the watch, but it doesn’t appear in Garmin Connect.

  • I tried connecting the watch to my computer and manually uploading the activity file, but the Garmin Connect website returned an error.

  • I also synced the device via Garmin Express, but the activity still doesn’t appear.

Could you please help me resolve this issue or advise how I can recover and upload this activity?