Question: HomeKit invitation failure, "Apple ID not registered with iCloud"
This error is driving me insane. Had previously successfully invited my wife to share control of our HomeKit accessories via Home app. Today I installed additional accessories but they weren't all showing up in the Home on her phone. Decided to remove her from the list of people who can control the home (it was only me and her), then tried to re-invite her.
For some reason, the invite sheet inside the Home app doesn't recognize her Apple ID email address as being valid, even though it is!
I tried deleting my "Home" and re-adding all the accessories back and then inviting her, to no avail.
I tried restricting the only email address under her contact card to the iCloud one, didn't work.
I even changed my Apple ID to use my iCloud email address instead of Gmail, but didn't work.
I am at my wit's end. Please help.