Hi. Thanks for your report.
PC Migration is a one-time transfer and can't be redone or undone with the same accounts. To transfer your correct Battle.net account to Steam, you'll have to create a new Steam account.
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That means I have already done it, and Its not on my steam account, does it take a while maybe ?
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It's possible that you accidentally used another Battle.net account to transfer to Steam. Regardless of what is appearing on your Steam account, since it's already been used to transfer it's impossible to be used again.
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it can. try to do it again. try a different browser.