Ah.. Finally got there. So I had that issue where it said I had an update but didn't actually update until I enabled Public Test Channel (PTC) after witch it updated Oculus Software to 13.1 and then it updated the whole Oculus Desktop software. Anyhow at this point the Quest headset shows as Version 13.0.0.298.463.195755071 (13.1?) while the Oculus Desktop App version is at 14.0.0.66.710?
Now I have a blue bar in the Oculus Desktop app saying "A Quest software update is recommended for Oculus Link (Beta). Install the update from the About section of Settings in your headset." But I'm checking and there is no Update in the About section of the Settings in the headset.
Anyhow, at least I finally have a way of using Unity with Link to test my app without having to build every time.
Perhaps you want to mention in your steps above about enabling PTC.