Average engagement time is 0m 00s, such as:
Average engagement time is calculated based on the user_engagement event, so your GA4 has not tracked the user_engagement event, and user_engagement is an automatically collected event, so you can’t make any settings.
Someone encountered this problem in February. The data was normal before, but it became 0 after a certain day, so I guess it is a bug.
- Wait for the official fix
- Create a new GA4 and reinstall