Granted or revoked privilege RECEIVE is not compatible with object

Hi,

I am enabling SQL dependency in my database.

So far I have 

USE MASTER

ALTER DATABASE SMT_Web_API_Admin SET NEW_BROKER WITH ROLLBACK IMMEDIATE

Running 

SELECT name, is_broker_enabled FROM sys.databases  WHERE name = 'SMT_Web_API_Admin'

Gets: 1

Next I have ran this against both master and SMT_Web_API_Admin

GRANT SUBSCRIBE QUERY NOTIFICATIONS TO SMT_Web_API_User

When I try running 

GRANT RECEIVE ON [Users] TO SMT_Web_API_User

Granted or revoked privilege RECEIVE is not compatible with object

I did this process once before but it was a while ago and can't remember how to do it. I know last time I got the table AspNet_SqlCacheTablesForChangeNotification which must get added when the failing SQL executes.

Please help if you can.

Thanks, 

Dave.