https://wccftech.com/playstation-5-dualsense-controller-switch-ps3/

The PlayStation 5 DualSense controller doesn't seem to work on PlayStation 4, but it does work on Nintendo Switch and PlayStation 3 with little to no trouble.

Twitter user BrokenGamezHDR confirmed today that the DualSense controller works on the Nintendo Switch by using a third-party adapter that can connect the controller with the console.