It should work. Once you create the Trusted Application key, it may take a few minutes for the Trusted Application to synchronize to your GroupWise system. Please wait a few minutes before attempting to use the solution or restart the GroupWise client.
You need to specify connection properties for one or all of the Post Offices in the system. While specifying Post Office connection information is optional, it ensures the application is able to access all objects in your GroupWise system, regardless of topology.
Have you specify the IP-Address for the Trusted Application? We recommend not to specify the IP Address which sometime can cause unable to login.
Hope this helps.