http://www.pcgamer.com/ark-survival-evolved-launched-on-windows-10-store-now-play-anywhere/

In the wake of its latest Aberration expansion, Ark: Survival Evolved has now launched on the Windows 10 Store as an Xbox Play Anywhere game. 

Much like other games that have walked similar paths—like, say, Fallout Shelter and Resident Evil 7: Biohazard—this means PC players who access Ark via the Windows 10 Store can now join their Xbox counterparts on the same servers as friends or as foes.