We're updating the Microsoft 365 sign-in page for Azure Active Directory (Azure AD) to add a new Sign-in options link. The Sign-in options link will be added only to sign-in pages which support Microsoft accounts. If the sign-in page your organization uses doesn't support Microsoft accounts, this change doesn't affect you. To find out if the sign-in page for your organization supports personal Microsoft accounts, see Sign-in options for Microsoft accounts.
After this change takes place, your users will see a new link that says "Sign-in options" on the sign-in page. Clicking the link shows additional sign-in options that only work with personal Microsoft accounts. The additional sign-in options can't be used for signing in to work or school account resources.
The new options will begin gradually rolling out to Azure AD organizations in early May 2019, and roll out is targeted to be complete worldwide by the middle of May 2019.