Exchange 2010 - Test User

I'm trying to run the cmdlet test-outlookconnectivity and other test cmdlets, but they fail.  I tried running the new-testcasconnectivityuser.ps1 script to create the test user they complain about, but it errors with an invalid error.  I have the OU = Users and my password met the complexity requirements.

[PS] C:\Program Files\Microsoft\Exchange Server\V14\Scripts>.\new-TestCasConnectivityUser.ps1
Please enter a temporary secure password for creating test users. For security purposes, the password will be changed r
egularly and automatically by the system.
Enter password: *************
Create test user on: EXCHANGE.domain.local
Click CTRL+Break to quit or click Enter to continue.:
CreateTestUser : Mailbox could not be created. Verify that OU ( Users ) exists and that password meets complexity requi
rements.
At C:\Program Files\Microsoft\Exchange Server\V14\Scripts\new-TestCasConnectivityUser.ps1:267 char:31
+       $result = CreateTestUser <<<<  $exchangeServer $mailboxServer $securePassword $OrganizationalUnit $UMDialPlan $
UMExtension $Prompt
    + CategoryInfo          : NotSpecified: (:) [Write-Error], WriteErrorException
    + FullyQualifiedErrorId : Microsoft.PowerShell.Commands.WriteErrorException,CreateTestUser