Recommended Authentication Apps
Smartphone app
Using an app on your smartphone to generate one-time OTP verification codes is more secure. The second-factor authentication is generated on a different device than the one used to access the system.
Microsoft Authenticator

Download link for Android: Play Store
Download link for iPhone: App Store
Google Authenticator

Download link for Android: Play Store
Download link for iPhone: App Store
Desktop applications
If a user does not have a compatible phone or is unable to install the authentication app on their phone for any reason, they can use desktop applications that can be installed on a desktop computer or laptop. Recommended options include:
Proton Authenticator

For Windows, Linux, Mac, iOS, Android
Download link
AuthWin

For Windows
Download link