Characters not showing anymore in PoE2 on PS5 after linking Steam account

I downloaded Steam to give a try to PoE 1 on PC. I already had this PoE account which is linked to my PSN account. After linking my Steam account I was able to switch between both accounts on any platform in PoE 1 from the starting menu but in PoE 2 I just lost the characters it seems and no way to switch like in PoE 1.

How am I supposed to recover them please? It's not like I care about the previous characters I had but I don't want the stash tabs to get lost since it seems to be using the wrong account now...

Thank you

PS: I also wanted to ask why is it that guild stash tabs bought in PoE 2 do not show in PoE 1 when the characters' ones do?