Best to get this out of the way before Mario Kart 8 Deluxe’s launch, I suppose.
If you are planning on accessing any of Nintendo’s online services next month, across either Nintendo 3DS, Wii U, or the Switch, you may want to take note of these times- it looks like Nintendo has announced server maintenance for next week, which means services will be offline for these periods.
Maintenance will first take place on Monday, April 17. It will start at 5pm PT (8pmET/7pm CT), and will last for two hours. This maintenance will only be taking Switch’s services offline- online functionality access, such as online play, leaderboards, friends list, and eShop, may be restricted during this period. A second round of maintenance will occur on Wednesday, April 19. Servers will be taken offline for an hour and 45 minutes, starting 6:45pm PT. Services on all Nintendo platforms will be affected during this period- so everything we mentioned above, plus also things such as SpotPass and Miiverse on Wii U and 3DS.
Best to get this done with before Mario Kart 8 Deluxe launches, Nintendo.