Hello there! I'm Eurocar ! I will try to assist you as much as I can.
due to the outside elements the outer tie rod end seizes to the inner tie rod end .
chances to get them to turn is almost impossible and you cannot use heat to break them free due to the bellows boots of the rack and pinion . they would melt
recommendation replace both inner and outer tie rod ends with bellows boot clamps
lube the threads with an anti sieze compound and then assemble
after that to perform the alignment correctly must go to the audi dealer . there is a special jig to set the bump steer toe correctly
if not the vehicle may have a drift