AudiA6Marty

Hi Folks !! New to the Forum !! Im looking help with an issue that has just arisen with my 2017 Audi A6. The keyless fob isnt opening/closing the car or starting it. I have changed the battery in both my main set of keys and the spare which wont do anything either. Im just over-riding the start by pressing the fob against the dash and im looking to see if anyone on here can help me out ? Any reccomendations are very welcome, thankyou in advance !! marty