After users registered themselves for the Microsoft Authenticator app, they need to enable phone sign-in:
- In Microsoft Authenticator, select the account registered.
- Select Enable phone sign-in.
- 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:
- Enters their name at the sign-in page.
- Selects Next.
- If necessary, selects Other ways to sign in.
- Selects Approve a request on my Authenticator app.