Azure Active Directory (Azure AD) Pass-through Authentication allows your users to sign in to both on-premises and cloud-based applications by using the same passwords. Pass-through Authentication signs users in by validating their passwords directly against on-premises Active Directory.
This is because, the program did not install correctly. You can read more on Pass-Through Authentication (PTA).
To resolve this issue., simply repair the AD Connect program as described below
– Launch the Windows Control Panel
Click on Program and Features as shown below
This will open the uninstall or change a program window as shown below
– Right click on Azure AD Connect and select repair or click on Azure AD Connect and select repair on the menu
This will launch the change, repair or remove installation window.
– Click on repair and
– Click on Next to continue
Click on Repair as shown below
As we can see below, the Azure AD Connect program is being repaired.
When this steps completes, we should see that the status of the AD Connect Tool on Azure AD will change to active.
I hope you found this blog post helpful. If you have any questions, please let me know in the comment session.