I first made my Bungie account by linking my Xbox account with it, and now (since last year) I linked it with my Sony account. I could view my Xbox friends without any trouble, but for PlayStation friends it doesn't show any and says something like "There was a problem with the login". To fix the issue I have to sign in again with my PSN. Also find it weird that logging in with my Xbox account only shows Xbox friends for whatever reason but logging in with my PSN shows both lists.