Error when adding mail ID ""Invalid Email This email address is not available. Choose a different address"
I purchased a new Iphone. I wanted to enter my data manually. When prompted for my email address, I was told the email address was already in use. So, I used my secondary email address. When I try to add my primary email, I receive the message "Invalid Email This email address is not available. Choose a different address". Please help.
[Re-Titled by Moderator]
iPhone 11, iOS 16