Solved: HomeKit Accessories Cannot be Controlled Remotely
MG on X: "This is not a good look Apple, but hopefully an oversight? Root cause seems to be that iOS Safari can no longer use local keychain for anything. That said,
How to setup & use iCloud Keychain on iPhone/iPad/Mac! [2023] - YouTube
Reset iCloud Keychain Security Code if iCloud Keychain was Locked
Cannot enable iCloud keychain | MacRumors Forums
Encryption defect in Apple's iPhone iCloud keychain