Hello,Yes! PC Gamepass and Steam users can play multiplayer together. In order to be able to connect, Steam users need to opt-in to the Stellaris_test branch.Right click Stellaris, go to properties > betas tab, and pick stellaris_test from the drop down. Hope this helps.

Originally posted by ComradeAure: Also I have both the steam and the game pass versions. So after that I checked it on steam, an I didn't see the game pass hosts. And the stellaris test version is not the same as the xbox game pass version of stellaris (2.7.1 and the test is 2.7.2).

The stellaris_test branch isn't being used for crossplay right now. It's being used for 2.7.2 beta so the crossplay branch is the correct branch for steam users to use for crossplay.