DIXF error during staging data export

Hello,

while testing the export function for data in the staging tables (execution history, view staging data, "Export to file") of the Data Import/Export Framework, I get this error message in the log:

"System.Exception: Exception from HRESULT: 0xC0202009 at Microsoft.Dynamics.AX.DMF.ServiceProxy.DmfEntityProxy.DoWork[T](Func`1 work)The data was not exported."

The error message is retrieved from a CLRError that is thrown when executing the call to dmfEntityProxy.ExportData() in method generateFileData of class DMFGenerateSSISPackage.

CIL is compiled and event logs do not have entries during the time the error message is created.

Note that there are three AOS for three different systems running on their own servers, but connecting to the same SQL Server where the "Microsoft Dynamics AX Data Import/Export Framework Service" is running. I'm guessing that this could be part of the problem (different systems running against the same DIXF service).

Any ideas what I could do to find out what causes the error?