So ... I have 2 SQL Server 2019 instances (CTP2.2) and I have one installed with Polybase in single node config (reference this as SS-A). I have created MASTER KEY in the master of SS-A, and created a DATABASE SCOPED CREDENTIAL in a database on SS-A. When I try to do the following:

```
CREATE EXTERNAL DATA SOURCE acmeAzureDB WITH
   (TYPE = RDBMS,
    LOCATION = 'ss2019azure.database.windows.net',
    DATABASE_NAME = 'dbAcmeAzure',  
    CREDENTIAL = acmeAzureCred 
     );

```

I get an error 

> 
> Msg 102, Level 15, State 1, Line 6  
> 
>  Incorrect syntax near 'RDBMS'
> 
> 
> 

I have tried to work with MS SQL Server SMEs without any luck (been working on this for many weeks to no avail).
Any ideas here -- plus a message to Microsoft -- your docs on this are AWFUL!!