How to make odbc queries on db's on the same server, but registered to different domains?

I have two domains (A and B) hosted on the same server.  I need to query sql db's on one domain from the other domain.

I thought it should be as easy as this, but it's not finding the db.

From Domain A:

<CFQUERY datasource="datasource on domain B" DBSERVER="serverurl for domain B" username="username" password="!password">

SELECT

*

FROM table

</CFQUERY>

Thanks!