CRM Online/Odata error: The 'Retrieve' method does not support entities of type 'activityparty

Im trying to get the data that is on the "Appointments" form in CRM Online.

As i understand it, appointments links to activityParies and  ActivityPointers.

this means most of the fields on a row pulled into PowerBI are either "Record" or "Table".

When i expand them i get an error:

DataSource.Error: OData: Request failed: The remote server returned an error: (500) Internal Server Error. (The 'Retrieve' method does not support entities of type 'activityparty'.)
Details:
 DataSourceKind=OData
 DataSourcePath=https://myCRMInstance.api.crm4.dynamics.com/api/data/v8.2/activityparties(nnnnnnnn-nnn-nnnn-nnnn-nnnnnnnnnnnn)/activityid_recurringappointmentmaster
 Url=https://myCRMInstance.api.crm4.dynamics.com/api/data/v8.2/activityparties(nnnnnnnn-nnn-nnnn-nnnn-nnnnnnnnnnnn)/activityid_recurringappointmentmaster

Im unsure how to handle this, or if getting the data i require from CRM Online is even possible.

Appreciate any comments or help with this.

Thanks,