Are there plans to add support for Microsoft Graph endpoints in US Government cloud? There has been a recent announcement of a "new Microsoft Graph endpoints for Microsoft Cloud for US Government. These new endpoints are specific to the US Government cloud and are segregated from the Microsoft worldwide cloud."
If you have the ability to build logic apps in Azure, this is a better way of getting data into Splunk: https://answers.splunk.com/answers/678660/how-to-get-logs-from-azure-and-o365-into-splunk.html