Family Health App Sharing - "Invite Pending" But No Invite Received

When I try to share health data with another iPhone, it simply does not work. I can send my health data to the other person but they cannot share it with me. It says "invite pending" but I do not receive any invite.

I made sure to follow each and every step listed here: Share and view health data in the Health app - Apple Support and no matter what I do, this issue still persists.

This issue has been reported by other users (here's another example: sharing health data - Apple Community) months ago, and still has not been resolved.

Is there anyone in Apple smart enough to resolve this issue? It clearly is a developer issue with the Health App.

The phone that is having a problem sharing is an iPhone 11.

I bought this phone and an apple watch, series 7, precisely to share health data to monitor my family and I cannot use it -- a very frustrating experience, to say the least.