After attaching the NES Controllers to Nintendo Switch, the console does not detect one or both controllers.
The NES Controllers are designed to work with NES – Nintendo Switch Online software. Although it's possible that these controllers can be used to navigate the Nintendo Switch menus and even play other games, we cannot ensure that all in-game options and features are supported.
The NES Controllers are intended to be used wirelessly with NES – Nintendo Switch Online software. While these controllers are attached to the console, not all buttons will be responsive, or the buttons will appear to have a different function when pressed.
When NES controllers are attached to a Nintendo Switch system, the system will not fit in the dock with LAN port.
What to Do:
Ensure that your console has the latest system update.
Attach the NES Controllers to the console, then from the HOME Menu, select “Controllers.”
If the NES Controllers are not responding, you can use the console touch screen to make your selections.
When the NES Controllers are registering as being attached to the console, they will be displayed in the Controllers screen like so:
If the NES Controllers are not registering correctly, detach them from the console and try the following with one controller at a time:
Reset the NES Controller. Press the SYNC Button once, then press any other button to power on the controller again.
Attach and detach the NES Controllers several times. Ensure that the NES Controller is correctly oriented and inserted all the way.
Verify that other controllers can be registered on the console. Attach a pair of Joy-Con and verify that they appear on the Controllers screen.
Situation Not Resolved:
If the NES Controllers are not recognized in the Controllers screen while they are attached to the Nintendo Switch console, but the Joy-Con can register correctly on the same console, then the non-working NES Controller(s) will need to be repaired.
Please contact Nintendo Consumer Support for further assistance.