Move an ea account

Do you mean move it to another Xbox Profile/MS account?

Or just to a different Xbox console?

Your ea account is available on any xbox that you log into just download the app and sign in.

If the things you have attached to EA are attached to MS like office subscriptions and stuff like that you can move them to account B but there may be other things that aren't as easy to move over. You can add EA to account B as an email to receive purchase
emails and security emails and just use EA to sign into the account with.

Hi All, I got FIFA 12 and guess what same thing, well after speaking to 7 EA Agents and telling the last 3 that I was so sick of it I was going to court on Monday the last one fixed the issue, the EA Gamer account had become corrupted and the DOB was incorrect
they cannot change it but moved the Gamertag to a new account and this fixed the issue.

So if you have this issue ask EA to move you to a new EA ID account and it should fix it.

Just having a look here: https://help.ea.com/au/help/account/link-your-console-accounts/

Have you tried creating a new EA account and then logging in with those credential when playing a game? Maybe that will will move the link to your new EA account.