My clubsport in for 2nd year service been told its due brake fluid change and ac regards at extortionate cost
Both optional money makers neither affect warranty in any way.
For ref we got a 2015 polo blue GT we have owned from new FVSH and been under VW extended warranty every year from new. Do 85k now.
Never had aircon service at vw but done elsewhere 2 times since new.
Just had aircon pump fail and was changed under vw warranty no questions asked ref aircon service, as they are advisory not compulsory.
Brake fluid is same advisory we have had that twice since new.
Will not affect warranty for anything either if you don't have it done.
Thats not just me saying this my mate works at VW in service.