Why does my program keep loading on the client's computer?

Hi guys, my PC VR program works fine on both my PC and laptop. However, when launched on the client’s computer, it only appears on the PC monitor, while the VR headset keep shows the “loading” message. It happens on both his PCs. Can you please advise what might be causing this issue?
UE: 5.1.1
MetaXR Plugin: V50
Device: both Meta Quest2 V50 with USB cable streaming