Apple ID not valid
Please how can I solve Apple ID not valid issue, please assist
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Get more support and assistance see -> Contact Apple for help with Apple ID account security
Contact Apple for help with Apple ID account security - 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