Can't Connect SSAS MD Database Through Data Gateway

Just upgraded to the data gateway version:  13.0.1700.1165.

I have existing connections that can connect to the SSAS servers.

I am able to add a new SQL Server connection.

All connections use the same service account. 

When I try to add a SSAS MD or SSAS Tabular connection, I get the error:

DM_GWPipeline_Gateway_AdomdConnectError

Any thoughts or debugging tips?

Thanks!