Nintendo is investigating a potential security breach after dozens of users reported unauthorised login attempts to their accounts.
Earlier this week, Nintendo advised users to activate two-factor authentication following a spate of third-party logins.
The issue was first highlighted by Twitter user Pixelpar, and was met with over 50 responses from people with similar concerns.
"We are aware of reports of unauthorized access to some Nintendo Accounts and we are investigating the situation," a Nintendo spokesperson told VGC.
"In the meantime, we recommend that users enable two-step verification for their Nintendo Account as instructed here.