Face ID

Hello sardar198.

Thanks for reaching out to Apple Support Communities. We understand that Face ID has stopped working on your iPhone XS Max. Face ID is a great feature, and we will be glad to assist.

Please see the following resource for the best steps to take: If Face ID isn't working on your iPhone or iPad Pro

Cheers.

If Face ID has been disabled, see if anything here helps 

Face ID - If an alert says has been disabled on your iPhone or iPad Pro.  *

Face ID not working.   -

Face ID not working' problems on iPhone.    -

Fix iPhone X Face ID Not Working.    -

Face ID Not Working.   -