Error Code: 2821-6002
The information in this article can help you when error code 2821-6002 appears when selecting Nintendo Switch Online from the HOME Menu on Nintendo Switch.
This error code indicates that maintenance is ongoing. If the issue persists, check for any maintenance notifications on the Network Maintenance page, then try again after the posted maintenance/service outage has ended. When maintenance is complete, you will be able to access Nintendo Switch Online from the HOME Menu.