Microsoft is updating the Office 365 login page with new sign-in options that will enable user access to their personal accounts. This new feature will be available from mid-February, 2019.
After this change takes place, when signing into Office, your users will see a new link that says “Sign-in options” on the Office 365 login page. Clicking on this link will bring the user to a new screen that will show additional
Initially, users will be able to use their GitHub account credentials to sign-in. If you have not granted your users access to GitHub, they will not be able to sign-in using their GitHub credentials. Over the coming months, LinkedIn and other sign-in options will be added.