After users registered themselves for the Microsoft Authenticator app, they need to enable phone sign-in:

  1. In Microsoft Authenticator, select the account registered.
  2. Select Enable phone sign-in.
  3. Follow the instructions in the app to finish registering the account for passwordless phone sign-in.

The first time a user starts the phone sign-in process, the user performs the following steps:

  1. Enters their name at the sign-in page.
  2. Selects Next.
  3. If necessary, selects Other ways to sign in.
  4. Selects Approve a request on my Authenticator app.