Why is my Apple Watch app update stuck on verifying?

Did you already try these troubleshooting steps?

1. Make sure that your Apple Watch is connecting properly to its charger. 
2. Restart your Apple Watch.
3. Restart your paired iPhone.
4. Try again to update your Apple Watch.

If the update won't start:

1. Open the Apple Watch app on your iPhone.
2. Tap General > Storage.
3. Delete the update file.
4. Try again to update your Apple Watch.

...

copied from: Update your Apple Watch - Apple Support

Which Apple Watch are you using?

Is your watch and iPhone connected to the same Wi-Fi and both being charged during this process?

Did you try to update directly on the watch, as explained in the second part of this article?

Update your Apple Watch - Apple Support

I have a series 8 Apple Watch and ever since the 11.2 update it constantly restarts and reboots. It won’t even track my sleep anymore because it reboots every single night, I wake up and have to enter my passcode again. Is anybody else having this issue?

I use the auto sleep tracker as well and it’s not tracking. It didn’t track at all the first week and now it stops in the middle of the night each night.

You're welcome 🙂

Enjoy your watch and watchOS 11.