Nintendo revealed some information today that Miitomo will be down for maintenance tonight. The maintenance work will take place between February 8th at 11:00 p.m. ET until February 9th at 5:00 a.m. ET.
The maintenance is being conducted to prepare for an upcoming big update. After maintenance is completed, the app can be updated to the newest version of Miitomo. During the maintenance period Miitomo won’t be available.
No worries, though. Super Mario Run and Fire Emblem Heroes are still a thing.