Missing Wahoo activities
The best option is to disconnect your Wahoo-Relive connection and reconnect it.
You can reconnect your account on your Wahoo app:
Open the Wahoo Elemnt app.
Navigate to Profile, Authorized Apps, and select Relive in the list.
Disconnect Relive and reconnect again by tapping the Allow button so that Wahoo has permission to upload activities to your Relive profile.
If the issue persists, please contact Wahoo's support team for more help.