Up to three Nintendo Switch consoles can be added to the Nintendo Switch Parental Controls app.
On your smart device, launch the Nintendo Switch Parental Controls app on your iOS or Android device.
Tap the + icon in the upper-right corner.
A list will appear of all linked consoles. Locate the console that you want to switch to, and tap it to make it the active console for the app.
If you’re not sure which console is correct, tap the Info icon next to each one to see the system’s serial number.