Reminders app shared lists: sync doesn't work
My wife and I share a reminders list but it doesn't synchronise properly.
If I create or update items on the list they propagate to my wife's phone, but any items she creates or updates don't get updated on my phone. I also have a Mac and any changes I make on my phone are reflected on my laptop (almost immediately) and vice-versa. The Mac also doesn't receive updates for any actions my wife takes on her phone either.
I have turned her phone off and on and also logged her out and back in to iCloud. Background app activity is on and reminders are obviously in iCloud. I have tried creating another shared list from her phone and sharing it with me and that seems to behave the same - I get the invite to the list, and any changes I make flow to her phone but any changes made to items on the list by her phone don't seem to propagate back to me.
These are both fully updated iPhone 12 Pros.
iPhone 12 Pro, iOS 17