Connect to cloud based SSAS not working in Designer

It's great to see efforts to support SSAS MD in latest PBID Nov release but unfortunately in our context it doesn't work. We are using an ssas server on a vm on Azure accessed using xxx.cloudapp.net. This approach works fine in Excel where you can also specify the desired user as opposed to automatic win auth (which doesn't seem possible in PBI Designer). When trying SSAS connect in PBI Designer I get "could not connect to server" error message.