Addressed Public PR changes #127508

Author: AbhishekMallick-MS

articles/backup/backup-azure-backup-vault-troubleshoot.md

@@ -2,7 +2,7 @@
 title: Troubleshoot Azure Backup Vault
 description: Symptoms, causes, and resolutions of the Azure Backup Vault related operations.
 ms.topic: troubleshooting
-ms.date: 07/16/2025
+ms.date: 08/14/2025
 ms.service: azure-backup
 author: AbhishekMallick-MS
 ms.author: v-mallicka
@@ -15,17 +15,31 @@ This article provides troubleshooting steps that help you resolve Azure Backup V
 
 ## Common user errors
 
-#### Error code: UserErrorSystemIdentityNotEnabledWithVault
+### UserErrorSystemIdentityNotEnabledWithVault
 
-**Possible Cause:** Backup Vault is created with System Identity enabled by default. This error appears when System Identity of the Backup Vault is in a disabled state and a backup related operation fails with this error. 
+**Error code**: `UserErrorSystemIdentityNotEnabledWithVault`
 
-**Resolution:** To resolve this error, enable the System Identity of the Backup Vault and reassign all the necessary roles to it. Else use a User Identity in its place with all the roles assigned and update  Managed Identity for all the Backup Instances using the now disabled System Identity. 
+**Cause**: Backup Vault is created with System Identity enabled by default. This error appears when System Identity of the Backup Vault is in a disabled state and a backup related operation fails with this error. 
 
-#### Error code: UserErrorUserIdentityNotFoundOrNotAssociatedWithVault
+**Recommended action**: To resolve this error, enable the System Identity of the Backup Vault and reassign all the necessary roles to it. Else use a User Identity in its place with all the roles assigned and update  Managed Identity for all the Backup Instances using the now disabled System Identity. 
 
-**Possible Cause:** Backup Instances can be created with a User Identity having all the required roles assigned to it. In addition, User Identity can also be used for operations like Encryption using a Customer Managed Key. This error appears when the particular User Identity is deleted or not attached with the Backup Vault.  
+### UserErrorUserIdentityNotFoundOrNotAssociatedWithVault
 
-**Resolution:** To resolve this error, assign the same or alternate User Identity to the Backup Vault and update the Backup Instance to use the new identity in latter case. Otherwise, enable the System Identity of the Backup Vault, update the Backup Instance and assign all the necessary roles to it. 
+**Error code**: `UserErrorUserIdentityNotFoundOrNotAssociatedWithVault`
+
+**Cause**: Backup Instances can be created with a User Identity having all the required roles assigned to it. In addition, User Identity can also be used for operations like Encryption using a Customer Managed Key. This error appears when the particular User Identity is deleted or not attached with the Backup Vault.  
+
+**Recommended action**: To resolve this error, assign the same or alternate User Identity to the Backup Vault and update the Backup Instance to use the new identity in latter case. Otherwise, enable the System Identity of the Backup Vault, update the Backup Instance and assign all the necessary roles to it. 
+
+### UserErrorStorageAccountKeyAccessDisallowed
+
+**Error code**: `UserErrorStorageAccountKeyAccessDisallowed`
+
+**Error message**: The storage account doesn't support key based authentication.
+
+**Cause**: Storage account doesn't permit key based authentication.
+
+**Recommended action**: Ensure that storage account key access is enabled, and then retry the operation. [Learn more](azure-kubernetes-service-backup-troubleshoot.md).
 
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