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BugZero found this defect 1670 days ago.
Backup jobs with Microsoft Exchange items may end up with the warning message shown in both the Veeam Backup for Microsoft 365 console and the Veeam.Archiver.Proxy.log file. 1/20/2020 6:30:28 AM62 (2600) Resolving group: 753da553-b4dd-45ad-a773-180aa920c887:00000000-0000-0000-0000-000000000000... 1/20/2020 6:30:28 AM62 (2600)Group found: TestOwnerGroup 1/20/2020 6:30:28 AM62 (2600)Resolving group mailbox (ID: 753da553-b4dd-45ad-a773-180aa920c887:00000000-0000-0000-0000-000000000000)... 1/20/2020 6:30:29 AM62 (2600)Found group mailbox: testgroup@organization.onmicrosoft.com 1/20/2020 6:30:29 AM62 (2600) Warning: Failed to find group owner account
Impersonation is not possible if Office 365 groups (mail-enabled and security groups) do not have an owner.
Make sure to assign an owner to each of the Office 365 groups (mail-enabled and security groups) as described in this Microsoft article.