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BugZero found this defect 1376 days ago.
A local backup repository fails to upgrade after upgrading to Veeam Backup for Microsoft 365 5.0 version 5.0.0.1061.
In case when the Team Chat folder has been protected with the earlier version of Veeam Backup for Microsoft 365, a backup repository may contain items with several versions that have identical timestamps. After the product is upgraded to version 5.0.0.1061, this causes a repository database conflict when upgrading local backup repositories.
To resolve the issue, please create a Veeam Support case.