PokerStarsVR creator here so maybe i can help.
How are you sharing your avatar ID's across users? In our case we send each user an RPC containing their avatar ID before the avatar is initialized. Another issue might be that you're not using the same app ID across both platforms, in that situation you'l want to look into app groupings since all avatar ID's are unique to your app
edit: and lastly if you get an occasional pure white avatar like Corysia sometimes sees in my game then that is down to a communication timeout with oculus servers or a user who has not yet customized their avatar