Cannot manage AppleID
I tried to manage my appleID but I couldn't because I cannot access (for 5 yrs) to the email address that I use for appleID. But I used it as apple id since my first time.
iMac Line (2012 and Later)
You might want to do a name change to get a working email address.
Note the restrictions in the article.
What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.