My iPhone camera fogged up and now my Face ID is not working

Liquid damage can't be repaired so you'll be offered a replacement at a price.

Let it dry for a day and pray no damage was done.

Then it's probably toast.

Have it examined by Apple.

Use Get Support link at the top right of this page for options.

No.

Water damage and damage caused by the user is not covered by any warranty.

Face ID uses the rear facing camera.

The front camera is under glass. How did it fog up? Take it swimming?

About two thirds of new but they vary.