I haven't tested the invite feature yet, but it would require the following:
* two Oculus accounts, running on real oculus equipment (unity editor without DK2 or CV1 will be kicked)
* An APK with a properly formatted androidmanifest.xml uploaded to the alpha channel
* both accounts invited to the alpha channel, having accepted the invite, and downloaded the app from the oculus store.
The app on the store doesn't have to be functional. After it's been installed once, it can be uninstalled, and working test builds can be run on the phone.
I suppose those two oculus accounts would also need to be eachother's friend.
Accurate to the best of my knowledge, hope it helps