Error Code 2124-4009 is received on Nintendo Switch.
What to Do:
Ensure your console has the latest system update.
If the console is already up to date, restart it by holding down the POWER Button for three seconds, then select "Power Options" > "Restart."
Review our Network Status page for any noted outages.
If you find notice of maintenance or a service outage, please try again after services have returned to normal.
Situation Not Resolved:
If the error persists and there are no known outages, the Nintendo Switch console may need to be inspected.
If you would like further assistance with the Nintendo Switch console, please contact Nintendo Customer Service.