Sorry for the confusion, Im using the ACS module as my reader and my Apex as a Yubikey for OTP. I’m currently not logging in with my Yubikey (I currently use my sxiid that as my computer password/login). HOWEVER, reading you’re able to log into your mac with a yubikey, it looks like the security protocol is PIV, I know the Apex has PGP so wasn’t sure if it was even possible.