@Damontech Face Unlocking will not be the most effective in low lighting conditions. check that you have the latest updates ,everything is fine in settings and there is not an issue with a screen protector.
Sometimes you may need to re register your face and delete the previous data.
See also some further information here https://www.getdroidtips.com/samsung-s23-ultra-face-unlock-not-working/
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
