Could you provide more details on your issue? Are you referring to having migrated a Battle.net account to Steam? Or are you attempting to use cross-save between your PSN and Steam accounts?
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I used the wrong steam account when migrating my battle.net account. I need to correct this before i make a purchase through steam.
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Once a Battle.net account has been migrated, it cannot be undone. You’ll need to use the Steam account that you originally linked during your PC Move setup, in order to access your characters and data. There is no option to reset, reverse, or redo a data migration, as it is a one-time thing. Hopefully you still have access to the Steam account you migrated to, as that is the account you’ll need to purchase content for, if you wish to use your former Battle.net characters.