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Hi Mahesh Kurucheti,
Thanks for reaching out to Microsoft!
As per the document , to use application permissions for this API, tenant administrators must create an application access policy and grant it to a user. This policy authorizes the app configured in the policy to fetch online meetings or online meeting artifacts on behalf of that user (with the user ID specified in the request path).
Please ensure that the application access policy is created and assigned to the user.
Hope this helps.
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