Azure AD supports the use of certificate-based authentication. Devices can use a client certificate to connect. This feature eliminates the need to enter a username/password combination to access your mail and Microsoft applications on your mobile device. You can use the following two sources to gather more information on the specific platform:

• Android: https://docs.microsoft.com/en-us/azure/active-directory/authentication/active-directory-certificate-based-authentication-android
• iOS: https://docs.microsoft.com/en-us/azure/active-directory/authentication/active-directory-certificate-based-authentication-ios

Otherwise, you can use the device authentication as an alternative method. We describe the device authentication in the next section.