Veeam released a version of Veeam Backup for Microsoft 365 v8.2.0.2202 (P20251031) on November 06, 2025, and it resolved the issue – A backup job may fail when processing Archive Mailbox objects with the following error:
Processing archive mailbox: username@organization.com failed with error: Mailbox is not fully configured.
The detailed information is below:
1.Login to Veeam Backup for the Microsoft 365 Manager server.
2.Sign in to your Veeam account and download the Veeam Backup for Microsoft 365 v8.2.0.2202 ISO image.
3.Open Veeam Backup for Microsoft 365 console.
4.Ensure all jobs are successful, disable them and close the console.
5.Mount Veeam Backup for Microsoft 365 v8.2 (VeeamBackupMicrosoft365_8.2.0.2202) ISO image file.
6.Double-click Veeam.Setup.exe.
7.Click Yes on the User Account Control page.
8.Click Update on the Veeam Backup for Microsoft 365 page.
9.Ensure you don’t have any unsupported operating system and click OK.
10.Click I Accept on the License Agreement page.
11.Click Browse license file on the License page.
12.Select a valid license file for Veeam Backup for Microsoft 365 v8.2 and click Open.
13.Click Next on the License page.
Note:
The Community Edition, Evaluation, and NFR, and NFR licenses require license auto-update to be enabled.
14.Please ensure the Veeam Backup for Microsoft 365 manager server meets the minimum system requirements.
15.Click Install with the default settings on the Ready to Install page.
16.Click Finish on the Veeam Backup for Microsoft 365 Successfully installed page.
17.Open Veeam Backup for Microsoft 365 console and click Connect.
18.Select Backup Infrastructure on the Veeam Backup for Microsoft 365 Console.
19.Right-click the out-of-date Proxy servers and select Upgrade.
20.On the Upgrade page, select all servers and click Next.
21.Click Finish on the Specify credentials to connect to proxy servers page.
22.Ensure the Proxy Servers were successfully upgraded, click OK.
23.Ensure there are no errors after the upgrade.
24.Select Organizations on the Veeam Backup for Microsoft 365 console.
25.Right-click Jobs. Select Enable.
26.Verify the Veeam Backup for Microsoft 365 version from Veeam Backup for Microsoft 365 console (Help |Abut).
27.Ensure the version is 8.2.0.2202 P20251031.
28. Login to the machine if you are using REST API on a separate machine.
29.Mount Veeam Backup for Microsoft 365 v8.2 (VeeamBackupMicrosoft365_8.2.0.2202) ISO image file.
30.Double-click Veeam.Setup.exe.
31.Click Yes on the User Account Control page.
32.Click Update on the Veeam Backup for Microsoft 365 page.
33.Ensure you don’t have any unsupported operating system and click OK.
34.Click I Accept on the License Agreement page.
35.Please ensure the Veeam Backup for Microsoft 365 REST API machine meets the minimum system requirements.
36.Click Install with the default settings on the Ready to Install page.
37.Click Finish on the Veeam Backup for Microsoft 365 Successfully installed page.
38.Check and ensure the Veeam Backup for Microsoft 365 REST API service is running.
I hope you enjoy this post.
Cary Sun
X: @SifuSun
Web Site: carysun.com
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