The reason you're getting errors is that an EA account can only ever be linked to one of a specific type of account in its lifetime. If you look at our unlinking article:
When you link accounts, it creates a lifetime link to protect you from malicious activity and help prevent performance issues in your games.
You can unlink your platform accounts from your EA Account if you want to link them to a different EA Account, as long as that EA Account has never had the same account type linked to it before in its lifetime.
That means if you unlink an Xbox gamertag from your EA Account, you can’t link a different Xbox gamertag to it in the future.
You can try reaching out to our live support team to see if they can help you out if it wasn't your Steam account.
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