Right side tail light running lights out but all bulbs working
 

I have a 2001 audi a6 2.8l and the tail light on passenger side wen I turn on my running lights don't work but the brake light work the signal works the reverse bulbs all work. I've tried 3 different plug like things that the bulbs go into where it clips into the back of the tail light.. there all new bulbs I've replaced all fuses twice and still nothing pissing me off help lol