https://www.vg247.com/2020/03/17/nintendo-switch-online-eshop-down/
" Nintendo Switch Online, the console’s multiplayer service, as well as the eShop digital store have largely been inaccessible for many over the past couple of hours. The outage appears to be worldwide."
Unfortunately, we're having some issues with our network services. We're looking to rectify the situation as soon as possible. Thank you for your patience. https://t.co/O9u3MXDZG6
— Nintendo of Europe (@NintendoEurope) March 17, 2020
"Although Nintendo didn’t specify, the outage is likely a result of a surge in user activity now that more and more people are stuck home thanks to coronavirus-related curfews and such. This is what happened with Xbox Live over the weekend. It’s also the same witnessed by other services, such as Discord. "