There are two apps for authentication with Google accounts:
- Google Authentication is an older app that relies on a system that Google has retired.
- Google+ Sign-In is the app you should use now.
If you're still using Google Authentication, you should switch over to Google+ Sign-In as soon as possible. The system that the Google Authentication app relied on is no longer supported by Google.
If you are using Deskpro On-Premise, make sure to update your helpdesk to the latest version before installing the Google+ Sign-In app.