Trouble with Oculus Join Session Failure

Hello
I’m a developer who’s new to using UE4 for networking.
I’ve been encountering some issues with Oculus development.
I’m trying to use session to connect between PC and Oculus.
I followed a tutorial (https://www.youtube.com/watch?v=NW4QHiK6YbQ) to implement session.
It works fine for connecting PCs and also works when Oculus is connected in windowed mode. However, in Oculus’s VR game mode, it can’t find other sessions.
This has been bothering me for days, and I can’t seem to find a solution.
Has anyone else encountered the same issue and found a solution?
Thank for any help