Uri parameter missing when trying to create a DNS-registered namespace?

Hi,

This page describes DNS-registered namespaces:
http://msdn.microsoft.com/en-us/library/windowsazure/dn441418.aspx

Here's the syntax of New-SBNamespace from that page:

New-SBNamespace -Name <String>[-AddressingScheme <NamespaceFormat>][-IssuerName <String>][-IssuerUri <String>][-ManageUsers <String[]>] [-PrimarySymmetricKey <String>][-SecondarySymmetricKey <String>][-Uri <String>]

However, when I run Get-Help New-SBNamespace, the -Uri parameter is not listed:
New-SBNamespace [-AddressingScheme <NamespaceFormat>] [-DnsEntry <String>] [-IssuerName <String>] [-IssuerUri
<String>] [-PrimarySymmetricKey <String>] [-SecondarySymmetricKey <String>] [-SubscriptionId <Guid>] -ManageUsers
<String[]> -Name <String> [<CommonParameters>]
When I try to use the Uri parameter, it says it doesn't exist:
PS C:\> New-SBNamespace -Name “Namespace" -AddressingScheme “DNSRegistered" -ManageUsers “Group" -Uri test
New-SBNamespace : A parameter cannot be found that matches parameter name 'Uri'.
But if I try to use New-SBNamespace without the Uri parameter, I get an error saying it's required:
PS C:\> New-SBNamespace -Name “Namespace" -AddressingScheme “DNSRegistered" -ManageUsers “Group"
New-SBNamespace : When AddressingScheme is set to DNSRegistered, the registered Uri Authority should also be specified.
Is it a different parameter I'm supposed to use instead of -Uri or is there something else I'm missing?
Thanks,
-Ben