you can also get it from a ps5, export ps4 saves. the only thing about the ps5 is you may have to be activated, just like the ps4, and you'd have to have signed in at least once for it to appear (it's in the save database as well on user partition). you'll know this because your psn name will be italicized, but yeah, as a last resort, you can always get it from a pc browser. you can technically get your psn id, even if you've never signed in on any system. it's created the moment you make the account.