Trade In - faulty Face ID

Hello,

I am looking to trade in my current phone for an upgrade

I currently have the iPhone XR - 128GB

when going through to trade in it asks me for the condition of my phone

front & back cameras, all buttons, screen and general phone body is all in very good condition

there is a fault with the Face ID however

i am just enquiring as to ask how much would I get for trade in price?

thanks

Lloyd