My vintage Newmar has a wall switch ( only ) for the ceiling lights ( nothing on the actual door ). So perhaps your coach has an over ride switch next to the porch light , and step override , that's stopping their function .
Or has someone turned them off at the fixture?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.