apple id is not valid or supported? to log into my icloud
i never been able to log into my Icloud email that is always linked with my Gmail/Apple id
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See -> If you can't connect or sign in to iCloud -> If you can't connect or sign in to iCloud - Apple Support
BTW:
You are sign in here . . . with your Apple ID & Password.
Your Apple ID is the personal account you use with all Apple products and services. It includes the email address and password you use to sign in, as well as the contact, payment, and security details that you use with Apple.
You can’t merge multiple Apple ID accounts.
What happens when you use the same Apple ID & Password that you use to sign in here?
See -> Sign in with your Apple ID -> Sign in with your Apple ID - Apple Support