Nintendo will discontinue Google and Apple account sign-ins for Nintendo Accounts on Jan. 26, 2027, with the exact end time subject to change. Afterward, users also won’t be able to create Nintendo Accounts through Google or Apple, and the My Nintendo Platinum Points mission for linking a Google account will end. Nintendo Account holders should prepare to sign in with their email address or Sign-In ID and password, or register a passkey; users who have forgotten their password can request a reset through the login page.
Source: Nintendo