Trying to follow a SQL Service Broker Step By Step configuration, what am I missing?

I've never used SSB before and is looking to implement this due to an issue we recently had with long running queries executing from a trigger.

I'm following the guide below. Looks OK when I run each code and I'm kind of following what is happening.

https://sqlperformance.com/2014/03/sql-performance/configuring-service-broker

Anyway, I wanted to test an email notification. So on the [ProcessingQueueActivation] SPROC, I inserted the lines below (send mail part):

    IF @message_type_name = N'AsyncRequest'
    BEGIN
      -- Handle complex long processing here
      -- For demonstration we'll pull the account number and send a reply back only
      DECLARE @AccountNumber INT = @message_body.value('(AsyncRequest/AccountNumber)[1]', 'INT');
                            -- ADDED PART START 			
                            EXEC msdb.dbo.sp_send_dbmail
				@profile_name		 = 'MYPRODILE',
				@recipients            = 'myname@mycompany.org',
				@subject               = 'BROKER TEST',
				@body                  =  @AccountNumber;

                             -- ADDED PART END
 
      -- Build reply message and send back
      DECLARE @reply_message_body XML = N'
        ' + CAST(@AccountNumber AS NVARCHAR(11)) + '
      ';

I tested it and I got the email when I run the script below.

EXECUTE dbo.SendBrokerMessage
  @FromService = N'RequestService',
  @ToService   = N'ProcessingService',
  @Contract    = N'AsyncContract',
  @MessageType = N'AsyncRequest',
  @MessageBody = N'<AsyncRequest><AccountNumber>04</AccountNumber></AsyncRequest>';
 EXECUTE dbo.ProcessingQueueActivation;
 EXECUTE dbo.RequestQueueActivation;

However, when I turn on the AUTOMATE PROCESS (below), I don't get any email at all. I don't see any records on the [ProcessingQueue] and [RequestQueue] so I'm assuming it got processed.

-- Alter the processing queue to specify internal activation
ALTER QUEUE ProcessingQueue
    WITH ACTIVATION
    ( 
      STATUS = ON,
      PROCEDURE_NAME = dbo.ProcessingQueueActivation,
      MAX_QUEUE_READERS = 10,
      EXECUTE AS SELF
    );
GO
-- Alter the request queue to specify internal activation
ALTER QUEUE RequestQueue
    WITH ACTIVATION
    ( 
      STATUS = ON,
      PROCEDURE_NAME = dbo.RequestQueueActivation,
      MAX_QUEUE_READERS = 10,
      EXECUTE AS SELF
    );
GO

Any ideas?

TIA