[Help] Update removed face recognition unlock

I updated my phone overnight last night, and now when I unlock it I get the following message:

"Enter your pin as required by the security policy instead of using face recognition"

I went into security settings and face recognition was enabled. Turning the setting off and on again didn't help, and neither did restarting the phone.

I googled the error message and it looks like there have been similar problems when using apps that automatically lock your phone, but I'm not running any of those.

Does anybody have any ideas? Thank you in advance.