Some Android phones require extra settings to be turned on or signing in to their account system, which is unique to that OS flavour, such as Xiaomi. Or you could have a faulty USB cable and or ports.

Try other phones as well.

Also, try all the steps here. https://sidequestvr.com/space/142/p/700315/unauthorized-unable-to-connect-the-quest-apps-not-installing-cant-see-apps-once-installed-heres-why