After upgrading Veeam Backup for Microsoft 365 from v5 to v6a, during the next backup run, or when editing the job or organization, the following error occurs:
Invalid backup configuration: Team chats backup using protected APIs must the enabled to protect Team chats.
Veeam Backup for Microsoft 365 6.0 contains specific changes that will help avoid the issue covered by this article. For that reason, if you plan to leverage Graph API to protect Teams data, and you are on version 5 or lower, upgrade to Veeam Backup for Microsoft 365 6.0 first and then upgrade to 6a. After using that upgrade path, review KB4340: How To Configure Veeam Backup for Microsoft 365 to Use Microsoft Graph Export API for Teams.
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