Apple Watch
I’m not able to connect my watch to my phone.
Question marked as
Which Apple Watch and iPhone do you have, and which software versions are installed?
You can only pair an Apple Watch having watchOS 9 installed, with an iPhone, running iOS 16, for example.
Older Apple Watch models and software may also need an iPhone with a previous iOS version.
Have a look at this article:
Set up and pair your Apple Watch with iPhone - Apple Support