Veeam Backup for Microsoft 365 “objects types are unsupported in the modern app-only authentication mode”

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After Microsoft’s deprecation of basic authentication, item’s that were excluded that aren’t supported in modern app-only authentication mode will raise a warning. The warning will specify, “Found # excluded objects. Some of the objects specified for exclusion will be ignored during processing because such objects types are unsupported in the modern app-only authentication mode.” If you are unsure what is no logner supported, you can check HERE.

To resolve this warning:

  • Navigate to the Select objects to exclude tab.

  • Find the excluded object on the list, and remove the object. (As the object is not supported, it will not backup be default)



  • Save the job settings.

If you continue to experience issues with your M365 job, or any Veeam issue, please reach out to Support@Managecast.com.

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