iPhone XS max Face ID is not working

You likely have permanently damaged your phone.

• Important handling information for iPhone - Apple Support
• Water and other liquid damage to iPhone or iPod isn't covered by warranty - Apple Support

Make an appointment to have your phone examined, and they will detail your options:

Genius Bar Reservation and Apple Support Options - Apple

athira259 Said:

"iPhone XS max Face ID is not working: I dropped my phone in water. After that my Face ID is not working"

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For reference...

Troubleshooting Face ID:

Start here: If an Alert Says Face ID has been Disabled on your iPhone or iPad Pro - Apple Support

No Success?

Refer to the tips mentioned on these links:

• If Face ID isn't Working on your iPhone or iPad Pro - Apple Support

• If you can’t Turn on or Sign in to iMessage or FaceTime - Apple Support

• If you can't Make a FaceTime Call on your iPhone, iPad, or iPod touch - Apple Support

• If you Experience an Error when Trying to Activate iMessage or FaceTime - Apple Support