Cannot add data source to enterprise gateway

Hi,

I am a pro user. 

I am trying to configure the  enterprise gateway and to add a data source (SQL Server) to it for a scheduled refresh. 

Somehow I getting the error code of DMTS_PublishDatasourceToClusterErrorCode  (status = 400) when adding the data source. 

This happens in both authentication methods (Basic & Windows) when I am using my organisation account user and password.

I was able to work using the personal gateway , but now the model become larger so I need to use the enterprise gateway. 

Any idea how this can be solved ?