If you choose “Hide My Email” when signing in with Apple, Apple automatically generates a relay email address.
This email address (with the @privaterelay.appleid.com domain) is not your actual address—it is issued by Apple.
Emails from Zaiko will be sent to this relay address and then forwarded to your real email address.
You cannot log in directly with this relay address.
To access your account, you must always use “Sign in with Apple.”
Entering your usual email address will not work.
👉 Apple Support: Manage apps that you use with “Sign in with Apple”
https://support.apple.com/en-us/102571