Apple Watch not working properly

It's probably trying to install companion apps to some apps on your phone that is linked to an old apple ID

Check out:

Install apps on your Apple Watch - Apple Support

And How to use your iPhone to manage your watch apps

Try and install one of the apps there. I think you will find that this replicates the issue.

Once you see what apps that does this. the solution is to delete this app from the phone. And reinstall linking it to your own apple ID.

Good luck!

Open your Apple Watch app on your phone and go to “My Watch”

Go to Settings/General & turn off Automatic App Install.

Now go back to “My Watch” and scroll to the bottom to see “Available Apps”.

Any apps you see that are trying to install are the culprits causing the notifications!

Delete those apps from your phone, and if necessary reinstall them with your Apple ID used currently.

Turn Automatic App Install back on if necessary.

You're welcome.