VR Expansion Plugin Tracking issue

i have some issues using VRE plugin in 4.27, when i open plugin template project, and choose play as client In VR Preview, And I Turn off the Run Under One Process setting, My Camera fallen on the floor, AND I can’t Change My view Through my Oculus HMD, i just stuck in there, and i can’t figure this out. Does anybody know how to fix this , thanks a lot!