Can't launch XBox Game Pass for PC version after update

[Dyst0pian]

Hi,

Did the update for the DLC today, now when I try and launch the game it just opens the Gaming Services page of the store; where it clearly says it is already installed. Ripped and reinstalled it using Powershell and still no dice.

Got lots of other XBGP games installed that are launching fine (tested and successfully launched State of Decay 2, Bloodstained ROTN and Subnautica to confirm), so my xbox launcher and gaming services are working just dandy. The game was working fine prior to the update when I last launched it a few months back. 

Any idea what this might be? I can find evidence of this issue with game pass more generally but nothing specific about the update just gone and the DLC causing this to happen out of the blue?