Service Broker: Cross DB, Same Instance - Part 2

Hi,

I run the code sample below in a SQL Mgt Studio query window. I get no error messages. However, the two SELECT statements at the end produce undesireable results (see comments). My messages to not make it to the target queue; they get stuck in sys.transmission_queue with the error message in the final comment of the code. The server principal "ddddXXXXX" is a Windows Active Directory account that: 1) is a domain admin in the domain that my SQL Server box is a member server of, 2) is the login used by the "SQL Server (MSSQLSERVER)" service account, and 3) is a member of the SQL Server instance's sysadmin fixed server role.

What is it I'm missing that is denying a sysadmin login access to a database?

/***
Service Broker try 1
***/
USE master;
GO

CREATE DATABASE sbRespond;
GO

CREATE DATABASE sbEvent;
GO

USE sbRespond;
GO

CREATE MESSAGE TYPE ActivatedStudyMessage
VALIDATION = WELL_FORMED_XML;
GO

CREATE CONTRACT ActivatedStudyContract
(ActivatedStudyMessage SENT BY INITIATOR);
GO

CREATE QUEUE [dbo].[ActivatedStudyTargetQueue];
GO

CREATE SERVICE ActivatedStudyTargetService
ON QUEUE [dbo].[ActivatedStudyTargetQueue]
(ActivatedStudyContract);
GO

USE sbEvent;
GO

CREATE MESSAGE TYPE ActivatedStudyMessage
VALIDATION = WELL_FORMED_XML;
GO

CREATE CONTRACT ActivatedStudyContract
(ActivatedStudyMessage SENT BY INITIATOR);
GO

CREATE QUEUE [dbo].[ActivatedStudyInitiatorQueue];
GO

CREATE SERVICE ActivatedStudyInitiatorService
ON QUEUE [dbo].[ActivatedStudyInitiatorQueue];
GO

-- Send a message.
USE sbEvent;
GO

BEGIN TRANSACTION;
GO

DECLARE @message XML;
SET @message = N'
<message>
<PROT_ID>123456</PROT_ID>
<StudyID>AAAA1234</StudyID>
</message>
';

DECLARE @conversationHandle UNIQUEIDENTIFIER;

BEGIN DIALOG CONVERSATION @conversationHandle
FROM SERVICE ActivatedStudyInitiatorService
TO SERVICE 'ActivatedStudyTargetService'
ON CONTRACT ActivatedStudyContract
WITH ENCRYPTION = OFF;

SEND ON CONVERSATION @conversationHandle
MESSAGE TYPE ActivatedStudyMessage
(@message);

END CONVERSATION @conversationHandle;
GO

COMMIT TRANSACTION;
GO

USE sbRespond;
GO

SELECT * FROM [dbo].[ActivatedStudyTargetQueue];
GO
--The query above returns zero records

SELECT * FROM sbEvent.sys.transmission_queue;
GO
--The query above returns two records, each with this "transmission_status" value:
--An exception occurred while enqueueing a message in the target queue.
-- Error: 916, State: 3.
-- The server principal "ddddXXXXX" is not able to access the
-- database "sbRespond" under the current security context.