Issue Configuring Push Notifications Proxying for OWA for Devices

I have been attempting to configure Push Notifications per http://technet.microsoft.com/library/jj151815.aspx#bkmk_installmodule

When running the second PowerShell script I get the error 

"New-MsolServicePrincipalCredential : Invalid value for parameter. Parameter name: Credential.EndDate.

At c:\Users\User\Desktop\script2.ps1:25 char:5

*New-MsolServicePrincipalCredential -AppPrincipalId $p,AppPricipalId -Type a"

I do currently have another Federation Trust configured for this account with our test environment. Might this be causing this error? Any help would be appreciated.