If you use the parental control app on your Switch, you may have noticed that the service has been out for about a week.
Nintendo now appears to have restored the service and it should be back up and running again. unfortunately, October 13-15, 2024 I lost it and can’t recover it (thanks OatmealDome).
If you haven’t used the app before, the Parent Control Smart Devices app is a free app that lets you link your Switch to “easily monitor what and how your kids are playing.” You can also set certain restrictions directly from Nintendo Switch.