Turn on your Nintendo Switch
Open System Settings
Select Controllers and Sensors
Select Change Grip/Order
Press and hold the Sync button on the controller until the lights start flashing
Wait for the controller to connect
Press any button on the controller to confirm it is connected
For a wired connection, plug the controller into the Switch dock or console with a compatible USB cable
If needed, charge the controller and try again
If connection fails, restart the Switch and repeat the pairing steps