MDS2016 Excel add-in

Hello everyone;

I'm using Master data services 2016 =>the web App works correctly

Microsoft Excel 2016 64bits

I've downloaded MDS Excel add-in from: microsof website (ENU\x64)

I installed it and added it to Excel correctly 

when I try to connect to my MDS server , I get this error:

The connection failed because the URL is invalid or the version of the Master Data Services web application is not supported.

There was no listening endpoint on .... This is often due to an incorrect address or SOAP action. If present, see the InnerException element for more information. (Mscorlib) OperationId = fbeaa61d-fff0-44b7-a687-3210dde2b0c2

what should I do?