Works with yubikeys? iPhone Pin protection ?

Hi millertime

1: Can I use yubikeys as a login solution instead of the vendor solutions from Apple / Google / MS?

Yes, you can use YubiKeys/security keys as a method to unlock 1Password accounts secured by a passkey. When you sign up on iOS or Android, you will first be asked to create a passkey which can be stored in iCloud Keychain or Google Password Manager. Afterwards you can add your security key afterwards by heading to signing in to your account on 1Password.com, selecting your name in the top right, selecting Authentication, then select "Add a passkey."

Can the fallback solution be deactivated via the iPhone pin to enable access to 1 password? Apple has also recognized that it is a bad idea to give potential attackers access to the keychain via the iPhone PIN.

If your passkey is stored in iCloud Keychain, it will follow Apple's AutoFill settings on your device which does have a fallback to device passcode if biometrics are unavailable. Apple, as you mention, is previewing Stolen Device Protection in the iOS 17.3 beta which will give you an additional layer of security preventing access to your saved passwords in iCloud Keychain if your device is stolen and obtained your passcode.