Man, the Yubikey software is some absolute hot garbage.
"Oh yeah to scan QR codes under Wayland you need to have gnome-screenshot installed [which doesn't work on anything other than GNOME] [because we couldn't be bothered to implement the screen capture protocol correctly]"
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Yeah uh I don't think I'll be buying a Yubikey again, if this is the grade of support to expect, what the fuck
For the time being, this is the (irritating) workaround: https://github.com/Yubico/yubioath-flutter/issues/773#issuecomment-1085695989