Foreign tax credit always shown as 0 after multiple attempts to add it.

Hello, I am trying to add the foreign income tax credit to my return in Turbo Tax. I only paid interest on foreign wages earned from a job overseas. After I add the amount of the tax in the general income section on menu pages, the amount of the foreign credit is always 0. I have done this multiple times and it is never anything other than 0. Any help is appreciated!