Security token as 2nd factor for login

General Discussion
1

I got a security token SoloKeys Solo - FIDO2 security key
(USB only) https://solokeys.com/collections/all/products/solo?variant=29316722131008

It works for U2F authentication through a web browser as per
https://docs.01.org/clearlinux/latest/tutorials/yubikey-u2f.html

But how to use it as a 2nd factor for logins?
From where to get pam_u2f.so?

Any hint?

2

This is currently not yet integrated - We’ll put it on the list. It shouldn’t be too difficult to compile yourself, but, you can also wait for it to be available in a bundle.