Hello and welcome to Just Answer, my name is Matt.
There are NO fuses for this circuit.
The circuit is controlled by the TIPM (the black fusebox underhood).
We have had some problems with these TIPMs, so it is definitely a suspect.
Do you have any aftermarket add ons, like extra lights or trailer wiring?
How many miles on your truck?
Are you able to get to your local dealership?
It depends how much electrical experience you have.
Your truck is in warranty, so if you can get it to the dealer, the repair will be free.
In a case like this, I would locate the circuit on the bottom of the TIPM, power it up with my power-probe, and see if the bulb illuminates.
If it does, then the TIPM is faulty.
If not, then the circuit is open, which must be traced step-by-step.