beetleb I found this article on Nintendo's official website that shows their servers as currently online and functional: https://www.nintendo.com/consumer/network/en_na/network_status.jsp
It says "All servers are operating normally."
Additionally, it also states that from Monday, January 27, 2020 9 :50 PM - Monday, January 27, 2020 11 :30 PM Pacific Time they will be performing scheduled maintenance and that during the maintenance window, network services may be unavailable.
Seems like the issue is likely just locally on your end at this time. Hopefully it resolves soon so that you can get back in the games!