Hi Michael,
Just to clarify, you have performed all the steps listed below and
the solution does not work?
Partitioning Subscriber Accounts for Message Addressing by Phone
Cisco Unity allows you to partition subscriber accounts into separate groups to restrict who they can address messages to and who they can add to distribution lists, when they do so by phone.
To partition accounts, you define message addressing search scopes by associating subscribers with directory handlers.
By default, search scopes are defined for the system by the addressing option settings for the primary location that is configured for the Cisco Unity server. The option settings allow you to restrict message addressing to the global directory (all subscribers), to all subscribers in a dialing domain, or to all subscribers on the local Cisco Unity server.
When you associate subscribers with directory handlers, you can have Cisco Unity restrict their message addressing search scopes to the search option that is selected for the directory handler. The search option specified can be a dialing domain, the local Cisco Unity server, a location, a class of service or a public distribution list.
This can be useful for setting up a multi-tenant system where there is a need to prevent subscribers in one group from sending messages to subscribers in another group.
For example, if your organization needs to partition subscriber accounts into two groups such that subscribers in each group cannot address messages to subscribers in the other group, do the following tasks in order:
1. 
Create a separate class of service for each group.
2. Create a separate directory handler for each group for which the Search In options are set to a different one of the two classes of service that you created in task 1.
3. Create separate subscriber templates, and associate each template with a different one of the two directory handlers that you created in task 2.
4. Use the two templates to create the two groups of subscribers.
Note Changes to settings in a template do not affect any existing subscriber accounts that were based on that template. After you create subscribers, you cannot use a template to modify them.
Alternatively, if the subscriber accounts already exist and are members of separate public distribution lists, you can associate a different directory handler with each distribution list, then use the Bulk Edit utility to associate each group of subscribers with the applicable directory handler.
Use the following procedure to associate subscribers with directory handlers.
To Associate a Subscriber or a Subscriber Template with a Directory Handler
Step 1 In Cisco Unity Administrator, go to the Subscribers > Subscribers > Profile page or the Subscribers > Template > Profile page, as applicable.
Step 2 Click Limit Access To, and click Select.
Step 3 In the Directory Handler Selection dialog, search for the directory handler with which to associate the subscriber, and then double-click it.
Step 4 Click the Save icon.
To modify subscriber search scopes, you can use either the Cisco Unity Administrator or Bulk Edit:
•To do so for an individual subscriber or for a subscriber template by using Cisco Unity Administrator, do the procedure "To Associate a Subscriber or a Subscriber Template with a Directory Handler" and select the new directory handler in Step 3.
•To do so for a group of existing subscribers at once by using the Bulk Edit utility, see the Bulk Edit utility Help. The Bulk Edit utility is available in the Tools Depot. (To access Tools Depot, double-click the Cisco Unity Tools Depot icon on the Cisco Unity server desktop.)
Cheers!
Rob
