As a head's up, I found something a bit similar discussed a few days ago in Beta 1. Looks like an SMC reset did the trick. For those experiencing the behavior:
https://support.apple.com/en-ca/HT201295
kyriaqos
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I've also noticed TouchID doesn't allow adding a fingerprint. I can authenticate successfully to add a fingerprint, but nothing populates on screen to proceed.
In console, I see the following two errors:
Error Domain=com.apple.LocalAuthentication Code=-1000 "ACMContextCreate failed: -536870181" UserInfo={NSLocalizedDescription=ACMContextCreate failed: -536870181}
error 22:23:43.534189-0400 com.apple.preferences.password.remoteservice (null) failed to initialize: Error Domain=com.apple.LocalAuthentication Code=-1000 "ACMContextCreate failed: -536870181" UserInfo={NSLocalizedDescription=ACMContextCreate failed: -536870181}