Possible solution to not being able to accept an invitation.

Hi to all. Like many others we were victims of the recent HomeKit upgrade. Every person in our household could accept the invitation except one. After trying almost everything coming to mind, we think the solution is as follows:

If your home is upgraded to the new environment you need to have one or more AppleTV’s and or HomePods configured as a hub.

Second thing you need to do is upate every iOS, iPadOS, tvOS, watchOS and MacOS device you own to the latest OS-version to this date.

Next you need to upgrade the home app on all these devices. Devices that can not upgrade the home app need to be logged out of iCloud. Not just the home app, but a complete log off. Even better is to log off every device except the invitees iPhone.

After making sure all above steps are done, ask the home owner for a new invitation. This time you should be able to except without problems, though you’ll probably won’t notice. At least we didn’t.

Then force close the home app, an restart it. The new home should now be visible.

Now you can start log on to your Apple Watch, iPad, HomePod and other devices. Devices that aren’t supported with the new infrastructure will show the home, but you won’t be able to control any of the devices. So why bother and just delete the app from those devices.

This dreadful issue costed us about a week to figure out, with basically no help on the subject over the internet. I hope this helps you to solve it.