Site Mailbox setup in SP 2013 RTM

Hi,

I'm trying to setup Site Mailboxes in SP2013 RTM on Windows Server 2012 (following the documentation).

I'm getting an error when running the Get-SPAppPrincipal cmdlet which returns a NameID Null error.

When I run Get-SPTrustedSecurityTokenIssuer, I get the expected info except the NameId field is blank (Null).

When I run Get-SPAppPrincipal and provide Site and various NameIdentifier values (from the Get-SPTrustedSecurityTokenIssuer output), they all come back with an error saying "the app principal cannot be found".

I have tried to set the NameId or NameID, but cannot find a cmdlet that will let me do that.

   1. Is it possible to setup Site Mailboxes for On-Premises SP20-13 (not online/365)?

   2. Any known problems with setting Site Mailboxes up On-Premises?

   3. Any ideas what I'm doing wrong and/or haven't done yet?

Any help appreciated. Thanks in advance.

Stu