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Exchange Backup Jobs Warning "Failed to find group owner account"

KB ID: 3105
Product: Veeam Backup for Microsoft Office 365
Version: 2.0.0.594, 3.0, 4.0
Published: 2020-02-13
Last Modified: 2020-08-13
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Challenge

Backup jobs with Microsoft Exchange items may end up with the warning message shown in both the Veeam Backup for Microsoft Office 365 console and the Veeam.Archiver.Proxy.log file.

User-added image

1/20/2020 6:30:28 AM   62 (2600) Resolving group: 753da553-b4dd-45ad-a773-180aa920c887:00000000-0000-0000-0000-000000000000...
1/20/2020 6:30:28 AM   62 (2600)   Group found: TestOwnerGroup
1/20/2020 6:30:28 AM   62 (2600)   Resolving group mailbox (ID: 753da553-b4dd-45ad-a773-180aa920c887:00000000-0000-0000-0000-000000000000)...
1/20/2020 6:30:29 AM   62 (2600)     Found group mailbox: testgroup@organization.onmicrosoft.com
1/20/2020 6:30:29 AM   62 (2600) Warning: Failed to find group owner account

Cause

Impersonation is not possible if Office 365 groups (mail-enabled and security groups) do not have an owner.

Solution

Make sure to assign an owner to each of the Office 365 groups (mail-enabled and security groups) as described in this Microsoft article.
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