Hey there! PC Move is a one time transfer. Once you've transferred your battle.net account to your Steam account, you're stuck with that Steam account.
You will either have to play D2 using the account you transferred your data to, or start from scratch on the Steam account you originally were supposed to use.
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That's... really terrible. There is no way to re-grant a license to the correct account [b]at all?[/b] I.. guess I just won't play then. What a shame. :/
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Unfortunately, no. You will just have to make do with what you can to both of those Steam accounts.