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Face ID stop working for keyless driving

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I'd start with checking Face ID settings in the Tesla app, it's not unheard of for Face ID to get reset in third party apps, sometimes seemingly at random. If it's still on, flip the slider back and forth and force-quit the app.
 
Just as a note, the app (any app) only gets a yes/no return from the phone, so, it's always reset all the settings in the app or logout/in, turn on everything again, and it will be fine. When you do, be sure to check all the settings, as many default to off (like notifications).