I have a YubiKey 4 (no NFC) and it works well with LastPass. One problem that I'm having now is that when I "trust" my home computer for 30 days, I still get prompted to authenticate with my Yubikey.
I had gone through 2 instances of trusting my PC, and it's worked for 30 days in both instances. Now, it will not trust my computer at all and I must authenticate with my Yubikey every time.
I have followed (without success) the instructions here: https://lastpass.com/support.php?cmd=showfaq&id=1853
When I log in, it seems to take for about 5 seconds, then punts me to the Yubikey authentication again. I will get a login error if I do not authenticate. In the short time before I get punted to the MF Authentication page, Lastpass *will* autofill in usernames and passwords, but then logs me out when I don't authenticate.
Any reason why the "Trust this device for 30 days" option isn't sticking? I even checked my account for "trusted devices" and see that my main PC is listed and active, but the MF authentication doesn't seem to care.