Apple watch se not connecting to iPhone x
its shows iphone out of date this watch requires a newer version of os
iPhone X, iOS 16
Your watch might be running watchOS 10, your Apple Watch’s version is too new to run on your iPhone, watchOS 10 requires an iPhone XS running iOS 17 or later.
If your watch was at watchOS 9, It would work on your iPhone since it requires an iPhone 8 running iOS 16 or later