I got this fixed (finally).
I took the turn signal switch out to see if there was an issue. I was going to buy a new one but when I put it back in all three lights were working.
I'm not sure what the exact problem was but I read that the interrupter in the turn signal switch can cause the brake lights problems which is why I removed it.
At least they all work now! So if you have this problem that could be a solution for you too (for anyone reading this).