@ryanjpreston sorry to hear that it didn’t work with the nitrokey app.
Another option that comes to mind is to use the gpg keys on the librem key to encrypt the secrets used by oathtool similar to the options described at Use oathtool Linux command line for 2 step verification (2FA) at cyberciti.biz instead of the generated gpg key that is used in the example.
Might not be the most elegant way but it should work. Probably going to try it out the next time i’ve got access to the librem key and laptop