It should be possible to play The Outlast Trials together between all PC and PlayStation players, but, the console versions are still under development, Early Access is PC (Steam and Epic) only, and there is not a lot of information on when the console version will be ready.
Does The Outlast Trials Have Crossplay Between PC and PlayStation?
Since the Outlast Trials have been confirmed for PlayStation in the future, the natural question pops up: Will you be able to use Crossplay and play The Outlast Trials with your friends that have a PlayStation, as a PC user, and vice-versa? And also, will you be able to use Cross-Progression, if you own both PC and PlayStation? Let’s find out. The Outlast Trials are out since (the Early Access version, at least), and a lot of horror enthusiasts and fans of the Outlast franchise in general are already gathering to experience this brand-new multiplayer experience in the Outlast universe.