Hey guys got a bit of a sticky situation and in need of some help asap!

My brake lights dont work nor the secondary light in the filament gets power when my lights turn on! every single light works except that brake light on both sides! turn signal,fog, reverse, etc all work.
Now i know my brake switch works and my fuses are all good as the third brake light works in the rear centre and my Body control module works as i tested the brake light pin with a voltage reader and works every time i press the brake it lights up so i know the signal is being sent! now the only thing i can think of is wire issues or is there something else im missing?
Also to note is that my computer is not recognizing the brake light out it thinks its still working even tho its not when this whole issue occurred when a friend of mine told me that my brake lights aren't working only the middle light is.
Any help would be much appreciated or a point into the right direction or if someone has a circuit diagram as i cannot find one as i'm currently tearing the car apart to try and find where the brake light wire taps off to either side as i found the wire on both sides under the rear seat has no power so i guess i have to go further into the centre?

Kind regards