Our 2015 351RSTS has two switches also... one for the fan, one for the light. The fan won't operate via the wall switch unless you first open the vent (which is too high for my wife to reach). Silly design if you ask me. I'd much rather they'd made it an auto-open fan like the living area.
Mike, Sue, Sissy and Little Man
2015 Ford F350 Lariat FX4 6.7 CC DRW
2015 Eagle Premier 351RSTS