Microsoft Teams backup fails with the "Object reference not set to an instance of an object" error

KB ID: 4201
Product: Veeam Backup for Microsoft 365
Version: 5c (build 5.0.2.22)
Published: 2021-08-25
Last Modified: 2021-09-01
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Challenge

Backup of Microsoft Teams in Veeam Backup for Microsoft 365 fails with the following error:
Error: Object reference not set to an instance of an object.

Cause

This issue is related to recent changes in Microsoft Graph API response syntax to a specific request that Veeam Backup for Microsoft 365 uses to process Microsoft Teams.
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