The pc move from bnet to steam is a one time thing.
You can't do it a second time.
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yes i know, but my main bnet account has never been moved to steam, i link by mistake my secondary bnet account, and that account just have world of warcraft.
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Only thing you can do is create a new account to transfer from your 1st bnet account to the new steam one. As you already used your main steam account before you cant use it again.