Seems that NIntendo have removed the Golf Game from the Nintendo Switch, heres some info:

Switch hacker SciresM reported that Nintendoís recent firmware 4.0.0 has removed the golf game from the console. Specifically, he says all related APIs have been stubbed (meaning the function call is still here but does nothing), and the game itself has been overwritten with random data. Itís unclear why Nintendo made that decision. The golf game was a nice little touch and a good demonstration of Nintendoís spirit. Mainstream media loved the easter egg once it was revealed by hackers.