unable to communicate with the watch error comes

Hello chrishanzman,

Thanks for using the Apple Support Communities. We understand that you're experiencing an issue with your iPhone and Apple Watch. Just to verify, are you referring to the Unlock with Apple Watch feature? If so, please take a look at the following article.

If Unlock with Apple Watch isn't working on your iPhone 13

You'll see the article indicates that a fix was released with iOS 15.0.1. If you're not running that specific version of iOS, you might want to install this update to see if it helps.

How to back up your iPhone, iPad, and iPod touch

Update your iPhone, iPad, or iPod touch

Hope this helps!