Agreed. There is a tub clean feature/setting for front loaders, so it would makes sense to do that first. The only major concern I would have is what condition was it stored in? Was it left closed with water in the seal/etc. in a hot environment? The reason I ask this is that the front loaders can be much more sensitive to mildew odors if not properly handled after a load. Leaving the door open, wiping the door gasket, etc. has worked well with mine in a basement utility space.
On the other hand, I had an old top loader take on a very musty odor after a finished load of laundry was inadvertently left in it for two days in a hot & humid environment (outdoor utililty space, midsummer, Deep South.) It took about 6 months, several treatments with mildewcide, and some disassembly (to get to the tub and scrub the waterline) to remove the scent.