Jack

Did those 'null' keys exist with the previous version of the plugin?

I can duplicate that result when having keys that exist before upgrading the plugin. I'll get that fixed.

Yeah, it is annoying. I've just pushed an update with a work-around to not display null in that case.

Basic server response is now added when testing Yubikey server configuration and when adding a key to your account. No response information is (deliberately) given during normal authentication as doing...