Hi! This solution provided by J. Brielmaier worked! Downloading the nitrokey udev rules wasn't even necessary.
Thanks! * Jonathan Brielmaier <jonathan.brielma...@web.de>: > Hey Ray, > > I'm using a Nitrokey 3A NFC under Guix System. > > I have the following in my config.scm: > (use-package-modules security-token) > [...] > (udev-rules-service 'nitrokey libnitrokey) > > And FIDO in the web browser does work for me (e.g. gitlab.com or > webauthn.io). > > ~Jonathan