added new scenario

Author: SnehaSudhirG

articles/automation/troubleshoot/managed-identity.md

@@ -3,14 +3,30 @@ title: Troubleshoot Azure Automation managed identity issues
 description: This article tells how to troubleshoot and resolve issues when using a managed identity with an Automation account.
 services: automation
 ms.subservice:
-ms.date: 10/26/2021
+ms.date: 04/22/2024
 ms.topic: troubleshooting
 ---
 
 # Troubleshoot Azure Automation managed identity issues
 
 This article discusses solutions to problems that you might encounter when you use a managed identity with your Automation account. For general information about using managed identity with Automation accounts, see [Azure Automation account authentication overview](../automation-security-overview.md#managed-identities).
 
+
+## Scenario: Runbook with system assigned managed identity fails with 400 error message
+
+### Issue
+
+Runbook with system assigned managed identity fails with 400 error message.
+
+:::image type="content" source="./media/managed-identity/error-runbooks-system-assigned-managed-identity.png" alt-text="screenshot of failure of Runbook with system assigned managed identity." lightbox="./media/managed-identity/error-runbooks-system-assigned-managed-identity.png":::
+
+### Cause
+You haven't assigned permissions after creating the system-assigned managed identity. 
+
+### Resolution
+Ensure to assign the appropriate permissions for system-assigned managed identity. [Learn more](../enable-managed-identity-for-automation.md)
+
+
 ## Scenario: Managed Identity in a Runbook cannot authenticate against Azure
 
 ### Issue