I am making a VR game. When I try to Build & Run, with XR Plugin Management and the XR interaction toolkit installed, It simply says “No Android devices connected”, even though I have my Quest 1 plugged into my computer. When I go to the Oculus settings under XR Plugin Management, Quest 1 is not listed under target devices, I can only select Quest 2 and Quest Pro. I even tried reverting to an older version of Unity where I have always been able to build to the Quest 1, but the option is still not there.
I got it working, I just had to change the Oculus XR Plugin version in the package manager to 3.3.0.
Does it work when you just Build? (i.e. not Build & Run)? I have actually never used Build & Run although I’ve been developing in Unity VR for 5 years 
But I am building for Quest 1 and deploying via the MQDH every day without issue. I can send a working project if it helps. But first try Build and then deploy manually.