Illusive Error: Get-SwisData : An error occurred when verifying security for the message.

I keep getting the following error message when trying to connect to the Solarwinds application Server using a service account

Get-SwisData : An error occurred when verifying security for the message.

At line:1 char:1

+ Get-SwisData $swis "SELECT NodeID FROM Orion.Nodes"

+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    + CategoryInfo          : InvalidOperation: (:) [Get-SwisData], MessageSecurityException

    + FullyQualifiedErrorId : SwisError,SwisPowerShell.GetSwisData

Add-PSSnapin SwisSnapin

$Username = 'SolarWindsServAcct'

$Password = ConvertTo-SecureString -String '*********' -AsPlainText -Force

$cred = new-object -typename System.Management.Automation.PSCredential -argumentlist $Username,$Password

$swis = connect-swis -Host '133.33.33.33' -Credential $Cred

# check if node with vmIP exists in SolarWinds

Get-SwisData $swis "SELECT NodeID FROM Orion.Nodes"

I can connect to the Solarwinds database using SWQL studio just fine.

Any ideas why this is happening?

Thank you in advance!!!