Weird Brake Light

Love my '21 and especially love the ease of access for wrenching. Sadly, I've hit a bump and must ask for advice. The driver's side brake light only comes on when the headlights are on. The passenger's side is fine regardless. Fuses seem fine and it looks like the electrical connection in the back is solid. The connector though will not come off and I'm hesitant to apply too much force to remove.
Any ideas? I searched but had no luck but this forum is massive and I may not have put in the correct search. Thanks in advance

 

A blown fuse, bad tail light bulb, and a faulty tail light socket can prevent your tail lights from turning on along with the headlights.

 

Probably need a little more info. Have you or anyone else added any lighting, like the stupid raptor lights, or maybe some rear floods? Anything out of the ordinary or not stock?

 

Exactly what I was thinking: What kind of mods have you done, or had installed?

 

OP, did you buy the 4R new or previously owned?
Might still be under warranty.

 

Welcome. Agree with above, it's an obvious electrical issue. If there are no mods or anything. Did you buy it new?

 

Zero mods besides some interior protection (canvasback,etc…use it as my work truck). Purchased used from my sister and she’s not added a thing.
Here’s the weird thing, it didn’t seem to pop up until after a service at the dealership. That’s probably just a coincidence though