Apple ID sign-in verification error
Why am I unable to successfully sign in to my Apple ID account? I am using the correct Apple ID username and password, and have tried to login using two Wifi accounts and without wifi - just using data. The password IS correct - I've changed it to ensure this wasn't the problem - AND I have successfully logged into the Apple Support community using the same credentials.
Every time I try to login, the phone returns the message "Verification Failed; An unknown error occurred."
Thanks in advance.
iPhone 12, iOS 15