Face ID disable on my iPhone after dipping in water

It appears that there must have been some water damage to your iPhone.

Try the instructions in the following guides to address the Face ID issues that you are having.

👉 If an alert says Face ID has been disabled on your iPhone or iPad Pro - Apple Support

👉 If Face ID isn't working on your iPhone or iPad Pro - Apple Support

If the guides, above, do not help resolve the Face ID issues, then contact 👉 Official Apple SupportOR you can always get your iPhone examined at the Apple Store 👉 Genius Bar Reservation and Apple Support Options or at an Authorized Service Center for further diagnosis and a resolution.

Axel F.

You have caused water damage to your phone. It will most likely need to be replaced.

Make an appointment at the Genius Bar to have it diagnosed.

Genius Bar Reservation and Apple Support Options - Apple

Just to add to the other posts, water damage is not covered by any warranty.

You will have to pay for any repairs.