How to cross platform connect PC and PS5

[肉山大魔王]

My friend has a PS5,i have a pc,we want connect to play this game,but we cannot search each others' shift friend, please tell me y,thank u gus.

[B-o-B]

No idea about PS5 but Steam Settings > In-Game > scroll down to the bottom and you'll find this
https://help.steampowered.com/en/faqs/view/1433-AD20-F11D-B71E
See if it's changed in any way and is preventing you.