Hi,
Thank you for asking this question on the Microsoft Q&A Platform.
It seems there is some sort of permissions issue with your account and the error insuffcient priviledge points to that side. Also the Graph API is initiated and it seems there is similar thread on this error please review and see if it helps. Just checking if you have AzureAD modules updated and powershell running in a admin mode?
az-ad-app-permission-add-insufficient-privileges-to-complete-the-operation
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