QR codes are usually the fallback method, I believe, because they're clunky and they suck if you need to do it more than once per week. Laptops and phones use

QR codes are usually the fallback method, I believe, because they're clunky and they suck if you need to do it more than once per week. Laptops and phones use Bluetooth Low Energy (among others) to communicate (CTAP 2.2) which is what your computer may be waiting on. I can't tell you why you couldn't log in, I use Bitwarden's passkeys and they work reliably for me. If you want the added security your phone's hardware encryption provides, I believe there are a few annoyances, particularly with the way Android 13 and lower, but I haven't had to look into those yet.