Hey! I am having a very similar problem to this as-well!
Ue5.3.2 and MetaXR 62.
I can happily view my MR experience in vr preview with hand tracking and passthrough working fine.
But when I try to build to headset, it creates the APK fine but I cannot get passthrough working.
If I build APK with the settings shown by TrueFranco it succeeds but MR does not work it will be black and my hands disappear as-well.
Also would note I have to set the XR API to Epic Native Open XR else it will make the apk not open aswell!
If I build without OpenXR then the build succeeds but will just crash on launch 
Any ideas!