On Ubuntu 22.04 using the Firefox snap (latest, revision 1300).
I'm trying to use a security key with GitHub, Cloudflare and various other sites. When the site prompts me to use my key, the Firefox prompt window ("This site wants to authenticate you ... Connect a security key now, or cancel") shows up but no matter what I do the key does not seem to be recognised, or even seen, by Firefox.

Security keys worked fine on the .deb version of Firefox.

How do I configure snap to allow access to security keys?

Output of snap connections firefox:

Interface                 Plug                            Slot                             Notes

audio-playback            firefox:audio-playback          :audio-playback                  -

audio-record              firefox:audio-record            :audio-record                    -

avahi-observe             firefox:avahi-observe           :avahi-observe                   -

browser-support           firefox:browser-sandbox         :browser-support                 -

camera                    firefox:camera                  :camera                          -

content[gnome-3-38-2004]  firefox:gnome-3-38-2004         gnome-3-38-2004:gnome-3-38-2004  -

content[gtk-3-themes]     firefox:gtk-3-themes            gtk-common-themes:gtk-3-themes   -

content[icon-themes]      firefox:icon-themes             gtk-common-themes:icon-themes    -

content[sound-themes]     firefox:sound-themes            gtk-common-themes:sound-themes   -

cups-control              firefox:cups-control            :cups-control                    -

dbus                      -                               firefox:dbus-daemon              -

desktop                   firefox:desktop                 :desktop                         -

desktop-legacy            firefox:desktop-legacy          :desktop-legacy                  -

gsettings                 firefox:gsettings               :gsettings                       -

hardware-observe          firefox:hardware-observe        :hardware-observe                -

home                      firefox:home                    :home                            -

joystick                  firefox:joystick                :joystick                        -

mpris                     -                               firefox:mpris                    -

network                   firefox:network                 :network                         -

network-observe           firefox:network-observe         -                                -

opengl                    firefox:opengl                  :opengl                          -

personal-files            firefox:dot-mozilla-firefox     :personal-files                  -

removable-media           firefox:removable-media         :removable-media                 -

screen-inhibit-control    firefox:screen-inhibit-control  :screen-inhibit-control          -

system-files              firefox:etc-firefox-policies    :system-files                    -

system-packages-doc       firefox:system-packages-doc     :system-packages-doc             -

u2f-devices               firefox:u2f-devices             :u2f-devices                     -

unity7                    firefox:unity7                  :unity7                          -

upower-observe            firefox:upower-observe          :upower-observe                  -

wayland                   firefox:wayland                 :wayland                         -

x11                       firefox:x11                     :x11                             -

Note how :hardware-observe is already connected.

Any advice would be greatly appreciated.