I bought Forsaken dlc back in 2018 played it and went off for a while. Transfered my account from blizzard to steam when it asked me too but I didnt log on to confirm if everything transfered apart from seeing my characters. Now I started playing again on my ps5 with the same account and characters and I noticed it wants me to buy Forsaken pack which it says I dont have when I clearly played and completed the campaign.
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Expansion licenses like Forsaken don't transfer with Cross Save.