Sharing HomeKit problem - Apple ID is not registered with iCloud problem

I found that if you are getting this error message even after upgrading to latest iOS, your guest might not have an @icloud account.

I went into iCloud and enabled Mail, created an @icloud.com account and bam it worked when I used that id.

I figured out the problem. If you are on the latest build (At least 11.2.1), the person you're trying to invite must have iCloud Keychain turned on. Settings->Your Name (above Airplane Mode)->iCloud->Keychain

Turn that on. Saw someone post a recommendation for alternative software that can issue invites, and in the app description it mentioned something about the iCloud keychain. I checked my GF's phone and yep, it was off. Turned it on, and the invite went through finally.

I fix my problem by deleting all the devices in Home on my iPhone X and then flipping to my wife’s iPhone X as the starting point. From her phone I then shared to me and was able to accept invitation. I then added devices to her phone and they showed up on mine. No idea why it didn’t work the other way around. I’ve been on and off the phone with Apple engineering for a week with no resolution. This was the only workaround I was able to find.

Perhaps this will save everybody the trouble of shenanigans with trying to fix this. Same issue with my gf, same dumb message...the solution? Went under privacy>HomeKit on her phone, nothing was enabled, enabled all of it, resent invite, worked immediately.

After pulling my hair out trying to invite them via iCloud email address I tried inviting them using their 10-digit telephone number and Voila! It worked like a charm.

This helped me: https://www.reddit.com/r/HomeKit/comments/7irp8j/apple_id_is_not_registered_with _icloud/dr9xp5r/

I think this was mentioned earlier in the thread....I was finally able to get an invite to work by using my wife’s cell phone number and not her email. The invite came across instantly and now she can see all the HomeKit devices. Now if iHome would get their cloud service fixed so Alexa would work.....

Hi guys. I was having the same problem until I used my wife’s phone number instead of her email address. It went right through. I hope this helps everyone.

Thanks, this solved it for me. In my case I sent the invite to the associated phone number as there wasn't an @icloud email address.

Hi there,

I was also able to fix the problem by entering my girlfriends mobile number instead of email address.

Hope this works you as well.

Good luck!

This may help some of you.

I encountered the same problem as everyone else but was able to get around it by inviting the person from a different device, in my case my iPad.

Hope this helps!

I was frustrated by the same issue. I was able to add 3 members to Homekit but could not add the 4th. Advice found in Google, YouTube, and on this site was of no help. I had been sending the invite unsuccessfully from my iPhone. I then try sending it from my IPad, and it worked flawlessly. I’m not sure why, both devices had the latest update. I hope this helps.

Download the beta profile.

+1 for invite via phone number (used for iMessage and more) 😀!

I am having the same sort of issues. From what I read the homekit bug was resolved in 11.2 however I have updated all the family devices and the invite system is very hit and miss. I was able to invite my son but it fails on his device when accepting the invite and stays as pending on mine. More importantly I can't invite the wife getting the could not invite because the apple id is not register in iCloud error. Wish apple would sort this out ASAP.