Export-PowerBIReport Is not working as admin

I'm running Export-PowerBIReport as global admin and I'm receiving an 'Unauthorized' error (full error below) for reports in workspaces I am not assigned or other user's personal workspaces. I can list all the reports in all the personal workspaces of other people though. We are in the middle of the transition process to GCC from the public tenant, it would be nice to export all of our user's content from the public tenant before we lose access.

RequestId : cc691c42-e5fa-4919-976f-846d8a1acf7c
Response : Unauthorized (401): {"error":{"code":"PowerBINotAuthorizedException","pbi.error":{"code":"PowerBINotAuthorizedException","parameters":{},"details":[],"exceptionCulprit":1}}}
PowerBIErrorInfo :
ResponseDate : Thu, 09 Aug 2018 07:13:34 GMT
RequestMethod : GET
RequestUri : https://api.powerbi.com/v1.0/myorg/reports/46590729-0131-46a5-b702-bde21ed9033e/Export
InvocationInfo : {Export-PowerBIReport}
Line : Get-PowerBIReport -WorkspaceId 'df5e1412-b279-4955-988e-6917af3d02ac' -Scope Organization | %{Export-PowerBIReport -Id $.id -OutFile D:\ner.pbix }
Position : At line:1 char:96
+ ... rganization | %{Export-PowerBIReport -Id $.id -OutFile D:\ner.pbix }
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
StackTrace : at Microsoft.PowerBI.Api.V2.Reports.d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.PowerBI.Api.V2.ReportsExtensions.d__29.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.PowerBI.Api.V2.ReportsExtensions.ExportReport(IReports operations, String reportKey)
at Microsoft.PowerBI.Common.Api.Reports.ReportsClient.ExportReport(Guid reportId, Nullable`1 workspaceId)
at Microsoft.PowerBI.Commands.Reports.ExportPowerBIReport.ExecuteCmdlet()
at Microsoft.PowerBI.Commands.Common.PowerBICmdlet.ProcessRecord()
HistoryId : 173

Start with the Export-PowerBIReport invocation and the preceding Get-PowerBIReport command shown in the issue. Reproduce the GET request to the Power BI reports export endpoint using the reported workspace and report scope, then determine whether global-admin access should permit this export. Done means the authorization behavior is explained and the cmdlet or its documentation reflects the supported result.