Re: Is there a way to change my EA profile name on the Sims 4 gallery?
@RySBI Hi! I'm sorry you're having trouble! I did a bit of digging and it certainly seems that EA is a bit sketchy when it comes to unlinking accounts. I play on PC so I'm not familiar how the accounts work on console but you may find this article helpful.
Unlink your personas from your EA Account
Just pay close attention to a couple warning signs EA posted with regard to unlinking accounts. They really don't want to make it easy to unlink. :-(
Edit: @RySBI Sorry, I'm hoping that tagging you again will alert this for you. I just found another thread suggesting to call and request a persona transfer with a phone number.
Solved: Re: How to merge two origin accounts. - Answer HQ (ea.com)
That post is really old but it got a lot of XP so I'm hoping it works for you.