why is Itunes not recognizing my Apple ID?

[iMore Question]

My wife is trying to access her Itunes account on a new computer. The account ID and password were not accepted. She changed the password as instructed, but now there's a message that the ID which is her email address is not available. What is the problem?

 

[Ledsteplin]

Welcome to iMore! Have you tried adding her new computer to her account support profile?
https://idmsa.apple.com/IDMSWebAuth...portprofile.apple.com/homePage&language=US-EN