Veeam Backup for Microsoft 365 Restore Portal Error: "The server has rejected the client credentials"
| KB ID: | 4292 |
| Product: | Veeam Backup for Microsoft 365 | 6.0 |
| Published: | 2022-03-24 |
| Last Modified: | 2022-03-24 |
Challenge
When attempting to login to the Veeam Backup for Microsoft 365 Restore Portal, the following error occurs:
The server has rejected the client credentials.
Cause
At this time there are two know scenarios that may cause this issue:
Scenario 1: Certificate not added to the Trusted Root Certification Authorities
When configuring the "Enable restore operator authentication with Microsoft credentials" feature, a certificate was selected from the Certificate Store, or a certificate was imported. However, that certificate was not added to the Trusted Root Certification Authorities.
Scenario 2: Updated Application certificate not in Azure Active Directory
The application certificate within the Restore Portal settings has been updated, but it has not been added to the application settings of Azure Active Directory.
Solution
Scenario 1: Certificate not added to the Trusted Root Certification Authorities
Make sure that the certificate is added to the Trusted Root Certification Authorities.
Reference: Authentication Settings
Scenario 2: Updated Application certificate not in Azure Active Directory
If the certificate is updated within Veeam Backup for Microsoft 365 it must also be added in the application settings through the Azure AD admin center.
Reference: Restore Portal Settings
More information
If this issue persists, please create a Veeam Support Case.
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