I'm trying to invite people to Homekit's "Home" on the iPhone. I noticed that when I type names to search, some of the names are orange and some are gray. Those that are gray cannot be invited and as soon as I select one, I receive a message that says: "The invitation failed". (Please note, this is not the message that contains content that says: "The address is not registered on iCloud.")

At first, I thought it was because the contact I chose was not an Apple ID for that person, but I confirmed that it is. Next, I wondered if that person needed to use 2-factor authentication with Apple ID, but that didn't seem to matter.

So, then I created an Apple ID that had no connections with me (not in my family, not my name, etc.). Also, I'm greedy and I can't invite that Apple ID into Homekit's "My Home".

In my searches through the search engines I did not come across this question specifically about anything. Apple support forums seem to contain something about what determines when a contact is orange or gray. There are articles on how to invite people and also articles on how people have had problems with invitations in a constantly waiting status. There is a homekit.blog thread that alluded to this very closely, but the solutions were mixed.

Does anyone know why an Apple ID is not allowed to be invited to someone's home? Are there any specific requirements? Has anyone else encountered this problem?

Thank you in advance for any thoughts and help!

https://preview.redd.it/xoc0yy35egr41.png?width=1242&format=png&auto=webp&s=e8bd53484002a22e670add13c18a5b973aa6644f