Most "under step lights" are nothing but a clearance light placed in that location. I'd guess that if you look closely, it's the same as the running lights installed around the perimeter of your trailer.
Most are either LED or have an incandescent 194 "marker bulb".
I believe your trailer is a 2019 model? If so, it probably has LED marker lights and the understep light is also an LED. There has been a lot of corrosion "at the pigtails" on those lights. If you take the lens cover off, unscrew the two screws, you can pull it away from the frame rail to access the crimp connections about 8" behind the light. I'd guess, if it's LED, one of them is your issue. If it's incandescent, it's likely the bulb.
Replacement LED fixtures are available most anywhere. Last time I was in WalMart, they had several different styles. Auto Zone, NAPA, O'Reiley's or any other parts store.
ADDED: After I posted I see you edited your post to include a photo of the bulb. It's a 194 "marker light bulb".....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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