Had this for a while now. So I'll tell you the story of the the little A4 which won't flash.
When I got my A4, the dash works fine when you do a left indicator. The arros flashes fine on full clicked indicator and on lane change.
Right turn wouldn't work when you press it down, but it would if you did a lane change. Now no right works, lane change of full pressed down.
Hazard lights work fine.
Externally all lights work fine.
The bulbs are all fine.
LED in the dash is shown to work by the hazard light switch.
No faults showing on instruments either.