Non-cellular Apple Watch series four won't allow family member setup

Hi there,

According to Apple instructions for "Set up Apple Watch for a family member" (Set up Apple Watch for a family member - Apple Support,) you don't need a cellular version for family setup but that's not the experience I'm having - I'd welcome a trick to get past this.

The instructions say: What you need

• An Apple Watch Series 4 or later with cellular,* or Apple Watch SE with cellular, with watchOS 7 or later.
• An iPhone 6s or later with iOS 14 or later for the initial watch setup.

* A cellular plan isn't required to set up an Apple Watch for a family member, but is necessary for some features.

BUT, our Series 4 non-cellular isn't working(watch was at watch 9.3 before reset). AND our old iPhone 7 Plus (on iOS 15.7.3 and won't update further) ALSO won't work when trying to set up the Series 4 watch "For myself", suggesting it needs newer software that will load onto an iPhone 7 Plus.

So, essentially, I think the Apple website guidance is wrong, but I really want it to be true. Anybody have any tricks to get around these issues?

Thanks!