- Veeam Support Knowledge Base
- Exchange backup fails after upgrading to Veeam Backup for Microsoft 365 v5
Exchange backup fails after upgrading to Veeam Backup for Microsoft 365 v5
| KB ID: | 4169 |
| Product: | Veeam Backup for Microsoft Office 365 | 5.0 |
| Published: | 2021-05-21 |
| Last Modified: | 2021-05-28 |
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Challenge
After upgrading Veeam Backup for Microsoft 365 to v5, backup of Exchange Online data may fail with “Unauthorized (401)” error.
The issue affects organizations using Modern authentication and legacy protocols with application secret.
Cause
Solution
To add the "full_access_as_app" permission to your Azure AD app registration, do the following:
- Sign in to the Azure portal
- Go to Azure Active Directory > App registrations, and select your application.
- Select API permissions > Add a permission > APIs my organization uses
- Select Office 365 Exchange Online API in the list, go to the Application permissions tab and select the "full_access_as_app" permission.
More Information
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