I have been using my Xperia xa for some time now, always having face recognization on, suddenly it vanished, I still have access to other smart locks. I have tried cleaning the certificates. These are the apps with camera permissions.
Go to Settings/Apps, click the 'cogwheel' icon next to the menu to open the Configure apps page, select App permissions/Camera, select Show system from the menu, and ensure that Trusted Face is enabled.
If that doesn't work then you may need to do a 'Software Repair' with Xperia Companion.
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