- Veeam Support Knowledge Base
- "400 - Bad request - Value cannot be null. Parameter name: token" when performing Microsoft Teams backup
"400 - Bad request - Value cannot be null. Parameter name: token" when performing Microsoft Teams backup
| KB ID: | 4123 |
| Product: | Veeam Backup for Microsoft Office 365 | 5.0 |
| Published: | 2021-03-05 |
| Last Modified: | 2021-03-12 |
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Challenge
Cause
If a user never opened the Files tab of a team channel in Microsoft Teams, this tab is not linked to the Files document library in a corresponding SharePoint team site. In this case, Microsoft Graph request for such a document library fails with "404 - Not found" error.
Since recently, the error code in Microsoft Graph response has changed to "400 - Bad request - Value cannot be null. Parameter name: token". Veeam Backup for Microsoft 365 fails to interpret this unexpected response and cannot successfully continue backup of such teams.
Solution
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