Azure AD Sign-in Error 80003

Error 80003 - Invalid response received by Authentication Agent. An unknown error occurred while attempting to authentication against Active Directory on-premises.

About Azure Activity sign-in activity reports:

Azure Active Directory's reporting tool generates 'Sign-in activity' reports that give you insights on who has performed the tasks that are enlisted in the Audit logs.

• All Sign-in activity reports can be found under the Activity section of Azure Active Directory.
• The default list view of Audit logs can be customized by adding additional fields.
• The reports can also be filtered to let you view only the activities that are relevant. 
• Here is an example of how a sign-in activity report looks like:

  

Error description:

Invalid response was received by an authentication agent. An unknown error occurred while attempting to authentication against Active Directory on-premises. Raise a support ticket to get more details on the error.

Steps to raise a support ticket:

• Sign into the Azure portal and open Azure Active Directory.
• Scroll down to Troubleshooting + Support tab and select New support request.
• On the Basics tab, for Issue type, select Technical.
• For Service, select Azure Active Directory, and then click next.
• On the Problem tab, select a Severity level.
• Select a problem type, and then select a Category for that type. At this point, you are also offered self-help information for your problem category.
• Add the rest of your problem information and click Next.
• Provide your contact information and click Create.

  

Auditing Azure AD environments with ADAudit Plus:

ADAudit Plus offers change monitoring for your Azure AD environment with the following features:

• Correlated view across hybrid environments
• Real-time alerts
• Schedulable reports
• Autonomous change remediation
• Comprehensive search
• Out-of-the-box compliance reports