Why are there so many issues. I just purchased this device but for some reason

I just can’t see any of my activities listed and when I try to add them again it says there’s already an activity from that time frame so it’s either overlapping or I need to delete them.

The main issue is it doesn’t even show the activities so how can I delete them? The other issue is that there’s nowhere to find the coach anymore all of a sudden the AI feature is gone.

Urgently seeking help if anyone knows what to do.