powerapps and nav 2017 can read the OData flow

Hi,
I'm trying to demonstrate powerapps with NAV2017. In the powerapps app, I take the "dynamics NAV" connection and put the oData feed URL (which works in IE or Firefox). The login and company is entered and after 10 seconds I received a message "Data could not been loeaded correctly. Try again"

I tried different cronus companies (switzerland are always within parenthese like "CRONUS (Suisse) SA" and the ODataV4 feed too. If I put a totally incorrect companyname, I've the same message.
Any idea?
Thanx