The fact is there is no way to play Roblox on PS4 or PS5. Navigating to the Roblox page via the PlayStation console's browser, logging in, and attempting to access Roblox that way will not work. PS4 and PS5 do not currently support Roblox, so there's no way to brute force it.
Well, Roblox is there for you because as usual some game developer has been "inspired" by Among Us and has created what amounts to a carbon copy of the game. If you've got a bunch of friends in Roblox already, this is a great way to join up with them and try out this new sensation to see what all the fuss is about!
Thankfully, Roblox isn’t limited to a single system, and you can currently play that game on Microsoft Windows, Android, iOS, Xbox One, and macOS.
There’s a slight silver lining for PS4 players though because if you decide to switch to PC you can opt to use your PS4 controller instead of using a mouse and keyboard, and this is very beneficial for a seamless experience.
Currently, you only have access to Phasmophobia on Microsoft Windows PC with no plans to make it available for other systems at the moment.
Sadly Phasmophobia is not on any version of the XBOX currently and there are no signs of this happening any time soon.
It had an early release on Steam and Windows on September 18th of 2020 and then was later released with massive success due to the high influx of popularity from mass streaming online.