HCI to SuccessFactors: Failed to Connect to OData system

hello everybody,

I'm triing to connect an HCI to Successfactors following this document:

SAP HCI: Integrate with Success Factors using OData API Query ($Select and $Expand)

I used OdataV2 message protocol but I have this error when I try to retrieve Message Operation:

Failed to Connect to OData system, reason [Connection failure. HTTP status code 401]. Please check service URL and proxy settings

any suggestion?

I tried to use SOAP protocol in successfactors adapter but I don't see any result.

thanks in advance

Alessandro