Error Code: 2121-2101
You are unable to send or receive a friend request, and receive the error code 2121-2101.
This error indicates there is likely a temporary service outage related to friend services on Nintendo Switch.
What to Do:
- Visit the Network Maintenance Information / Operational Status page and check for any posted service maintenance or outages.
- Once the related maintenance has ended, try to use the friend service again.
Situation Not Resolved:
Try using the friend service at a later time.