Shared Reminders List NOT syncing in iOS 17.2.1

Shared Reminders are not syncing after upgrading to iOS 17.2.1.

This seems to be a re-occurring bug over the years (search up this exact same bug and you’ll find it circa 2020) that needs to get nipped in the butt once and for all.

Before the update, we’d been both on iOS 17.x and the Reminders App sync’d between my partner and I always.

We’ve since decided to share a Notes list where we can have radio button lists for groceries and you can see the other person in real-time writing in a new grocery item. So it is not either one of ours iPhones, (13 and R) rather it is the Reminders App itself that is the problem.