If you are writing a game in Unity, you will need to use a plugin that can communicate with CloudKit from C#. Two popular ones are the HovelHouse CloudKit plugin and the Prime31 one. I'm the author of the first. You can grab both on the asset store.
ohgodwhy
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After some testing, it seems that this error message is logged even when the match is connected successfully. If your match is not starting, I don't think this error has anything to do with ti.
@devon-redgames, igorland
I get this error too on occasion. I do not yet know the cause.
I believe the delegate that the error message is referring to is actually the listener on the GKLocalPlayer instance. See the protocol for GKInviteEventListener here: https://developer.apple.com/documentation/gamekit/gklocalplayerlistener?language=objc
There does not appear to be a delegate that handles invites on the GKMatch object at all.
Confirming the same error. I've created multiple cloudkit applications before, I'm sure my settings are correct.