Launch purchase with battle pass

I originally bought Diablo 4 when it launched. I remember it came with a free battle pass purchase that could be used later. I only played for a month or so before being bored and never bought the first battle pass.

I just reinstalled and thought I would try it out again, see whats changed. When I clicked on the ingame battle pass it says my purchase was converted into platinum, but it was still showing I had 0.

Any else do something similar or know what actually happened?