Can't Seem to manage my Apple ID

I was having the same issue, and I found a bit of a work around. First, I had to delete ALL of the phone numbers (daytime, evening and mobile). Delete the country code, area code and phone number. Once deleted, then save it. Then, enter just one of the phone numbers such as the mobile number and the hit save. That did it for me.

Below is an image of the problem I was experiencing.

That indicates the number you are entering isn't valid, are you formatting it correctly.

This worked for me as well! Thanks so much for sharing.

Thank you so much! This solved same issue for me!

Solve my problem, thanks

Brilliant, man, thank you!

Ditto, thanks. Seems like a VERY STUPID problem for Apple to have in a key piece of authentication.

Worked perfectly. Thanks so much. Why wouldn't they fix this???