Apple Watch SE won't record activity, even after numerous restarts

Hi Celeste2023,

Thanks for posting in Apple Support Communities.

It sounds like your watch is not showing activity and not waking when you raise your wrist. To address this behavior, make sure that your Apple Watch is running the latest software to ensure the most recent performance fixes. Restart both your watch and iPhone. If this continues, unpair Apple Watch and pair it again.

How to unpair and erase your Apple Watch if you have your iPhone

1. Keep your Apple Watch and iPhone close together as you unpair them.

2. Open the Apple Watch app on your iPhone.

3. Go to the My Watch tab and tap All Watches.

4. Tap the info button  next to the watch that you want to unpair. 

5.

6. Tap Unpair Apple Watch.

7.

8. Tap Unpair [your Apple Watch name].

9. For GPS + Cellular models, choose whether to keep or remove your cellular plan. 

* If you want to pair your Apple Watch and iPhone again, keep your plan. 

* If you don't want to pair your Apple Watch and iPhone again, remove your plan. If you aren't going to pair with a different watch or iPhone, you might need to contact your carrier to cancel your cellular subscription. 

12. Type your Apple ID password to disable Activation Lock, then tap Unpair. 

Before erasing all content and settings on your Apple Watch, your iPhone creates a new backup of your Apple Watch. You can use the backup to restore a new Apple Watch. After your Apple Watch unpairs, you'll see the Start Pairing message.

Unpair and erase your Apple Watch - Apple Support

Regards.