PowerShell Attempted to perform an unauthorised operation

Question

I'm trying to add a term store administrator using PowerShell. I'm logged on to one of the farm web servers with a farm administrator account (also happens to be a domain admin account too). I'm running the following PowerShell:

$ts = Get-SPTaxonomySession -Site https://test.splab.local
$termStore = $ts.TermStores["Tenant Taxonomy Proxy"]
$termStore.AddTermStoreAdministrator("splab\user1")

And I'm getting the following error:

Exception calling "AddTermStoreAdministrator" with "1" argument(s): "Attempted to perform an unauthorized operation"

I'm guessing this is some sort of permissions problem but no idea what.

Supplementary details: - SharePoint 2010 on top of Windows 2008 - Configured the web app to be multi-tenanted - Using Claims Based Authentication with a custom claims provider

Answer 1

Is the account you're using have Term Store Administrator rights in the farm? You may want to take a look at this blog post and see if your account is set up in the areas it mentions: http://jyothiregode.wordpress.com/2011/02/19/create-termset-programmatically-using-powershell-in-sharepoint-2010/

John