I basically have the same issue, but I do know it's a permissions issue. My splunk logs show this error:
APIError: "status=403, error_code=AuthorizationFailed, error_msg=The client 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx1133' with object id ''xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx1133' does not have authorization to perform action 'microsoft.insights/eventtypes/values/read' over scope '/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx12f4'."
I thought I configured everything correctly, but it's not pulling it. I use the same Active Directory Application in Azure AD for pulling Office 365 Management API Inputs and that works fine.
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