Since the other side works it is not the fuse or relay.
I have seen in many cases that the push in bulb contacts fails to properly connect to the socket. Try to pry the little wire out about 20 degrees from the flat side they are folded against. Then reinsert the bulb into the socket, and see if it works. If not with a DVM and some one to help see if the socket has power and ground. Which ever it does not will be the wire to fix.