It looks like you need to unlink the steam account you have linked from your battle.net, then start the link process over again. I didn’t migrate my battle.net account but did cross save with my Xbox instead since that was where I played the most so I’m not sure how to do all of that but good luck 👍
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This is what i have done several times over. I get to the part where i have to write '' i agree to transfer'' and it says that the account are now linked. After that i get the same error box over and over every time