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

On last Thursday we shared a HomeKit (host is my wife's iPad) to my wife's sister. From that moment, I lost connection with iPad - Home App on my iPhone was showing an error connecting to it. So, I removed my my account from guests, then her sister's. Now, my wife can't invite anyone - Home App is always telling that this Apple ID is not registered with iCloud.


I tried:

- to restart all devices

- log-out and log-in to iCloud on all devices

- reinstall Home App on all devices

- disable and enable contacts sync

- to send invitation from “guest” HomeKit to the “host” HomeKit - ironically same problem - Apple ID is not registered with iCloud


Nothing works. Now, only my wife can use HomeKit devices. What is going on or what am I doing wrong ?

iPad Mini Wi-Fi, iOS 11.2

Posted on Dec 11, 2017 4:55 AM

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Posted on Jan 12, 2018 10:21 PM

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.

147 replies

Dec 18, 2017 11:09 AM in response to Maciej Szydlowski

Me too! And I was choosing them from members of my family list. Complete with the apple id they have had for many years.


until I typed in my son’s name in the to: field and it came up with two email accounts, with one in orange.


The orange one was the @icloud wheras the one we used to use was the @me.com.


and once I selected/updated contacts to @icloud.com it all worked perfectly.

Dec 19, 2017 7:36 PM in response to brown3699

I have been working on this since 2 weeks.... since the time I got my Ecobee3 thermostat... thanks for some of the comments here but I have not got it working :-)

Trick is, as stated in one of the post, to ensure all ur devices are on 11.2.1 (or hopefully above).

This is what I did:

- upgraded my wife mobile and her iPad to 11.2.1

- both my phones were 11.2.1

- earlier I had added the ecobee3 on my phone and I was adding her using the home app but that use to give the error “the xxxxxx@gmail.com is not registered to iCloud” and when I tried to create a home at her iPad and add myself it use to say invitation pending but I will not receive anything. Once we had all 4. Devices on 11.2.1, I removed the home from my iPhone (as the iPad was on her Apple ID) and then converted her iPad to iHub and then added the ecobee3 thermostats to her device

- then I invited myself from her iPad and got the invitation instantaneously


Now I have all 4 devices with home kit having the ability to control the thermostats

Hope this works for you guys as well..


PS: I also turned keychain ON on all devices, not sure if that helped as well but I read in some blogs that for HomeKit you need to have this turned ON.

Good Luck

Dec 23, 2017 5:03 AM in response to Maciej Szydlowski

I had the same issue but somehow I got it fixed.


My iPhone is the main HomeKit controller and my wife's iPhone is the guest.

1) Upgrade all devices to iOS11.2.1 (but this step alone won't work immediately)

2) Remove all guests from the main controller (in my case, its mine)

3) If you have any existing invitation to a guest, cancel it

4) In the other device that was once the guest (in my case, its my wife's phone), leave the "home". You can do this by going to the bottom of the home's setting page and tap on "Remove Home"

5) Send the invite again.


Hope this helps.

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

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