That USB in and of itself probably isn't on an independent fuse. But if you wanted, you could look at the manual and see what fuse it'd be tied to and check it. That said, if a fuse on a 2020 is popped and you're not running any aftermarket accessories to it, something else is screwy. The simple (and short) answer is you're under warranty, take it to the dealer and let them figure it out while you're in a loaner.