What is the screen you see in the pairing code method ?
Viewing post in Report bugs or have questions comments
tl;dr fixed! (and I found what appeared to be the problem totally accidentally)
The paring code issue was my fault. I'll blame old eyes for not seeing the extra 'click' I needed to get to the code screen. Still didn't help. I uninstalled/rebooted/reinstalled SO many times. I even found a 'backup' folder and deleted it. I had just gone through removing EVERYTHING and revoking all USB debugging approvals (which I had done before, to no avail). What FINALLY seems to have made a difference was going to verify developer settings were set in the app for the device (even tho they were showing up in the headset, I was getting a bit desperate here and grasping and anything that even resembled a straw). The app did not think I had ever "completed" the setup for my Q3. I 'completed' it by basically tapping a couple of 'next' buttons, and THIS time when I connected the USB cable to my windows machine for side loading, all the pop-ups showed up like expected. A LOT. I clicked through 4 or 5 "always" options for either machine fingerprints or wifi signals. (oh! and I got the V71 update sometime between today and the last time I wrote).