Pc / psn problem with purchases …

I bought a key for PoE 2 on PC, but had no coins - since It wasn't the Early Access edition with coins included, so then I bought the game on PlayStation 5 as well, got the 300 coins, but then when I purchased stashes from the PS store (because It wouldn't let me do that with the coins from the website version), I couldn't use them when I played on the PC, says "removable only" next to the stash.
What can I do about that? I would like to use my stashes on both platforms, preferrably PC.