Powershell EWS Send Email from Shared Mailbox - powershell-2.0

Question

I am using Powershell and the Exchange Web Service (v1.2) to send an email through Office 365. As long as I use my credentials the script is able to send without an issue. However, for tracking purposes, on script errors I need to send the email from a shared mailbox instead of through my account. The error I get is:
Exception calling "AutodiscoverUrl" with "2" argument(s): "The Autodiscover service couldn't be located."
At F:\Scripting\1-Dev\Modules\Include.ps1:387 char:31
+ $service.AutodiscoverUrl <<<< ($Credential.UserName, {$true})
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : DotNetMethodException
I'm sure the problem is authentication. How can I authenticate and send from a shared mailbox in o365?
EDIT:
Here is the code that I'm using to send the email:
Function Send-O365Email {
[CmdletBinding()]
param(
[Parameter(Position=1, Mandatory=$true)]
[String[]] $To,
[Parameter(Position=2, Mandatory=$true)]
[String] $Subject,
[Parameter(Position=3, Mandatory=$true)]
[String] $Body,
[Parameter(Position=4, Mandatory=$true)]
[System.Management.Automation.PSCredential] $Credential,
[Parameter(Mandatory=$false)]
[String]$PathToAttachment
)
begin {
#Load the EWS Managed API Assembly
Add-Type -Path 'C:\Program Files\Microsoft\Exchange\Web Services\1.2\Microsoft.Exchange.WebServices.dll'
}
process {
#Create the EWS service object
$service = New-Object Microsoft.Exchange.WebServices.Data.ExchangeService -ArgumentList Exchange2010_SP1
#Set the credentials for Exchange Online
$service.Credentials = New-Object Microsoft.Exchange.WebServices.Data.WebCredentials -ArgumentList `
$Credential.UserName, $Credential.GetNetworkCredential().Password
#Determine the EWS endpoint using autodiscover
$service.AutodiscoverUrl($Credential.UserName, {$true})
#Create the email message and set the Subject and Body
$message = New-Object Microsoft.Exchange.WebServices.Data.EmailMessage -ArgumentList $service
$message.Subject = $Subject
$message.Body = $Body
$message.Body.BodyType = 'HTML'
if (Test-Path $Attachment) {
$message.Attachments.AddFileAttachment("$Attachment");
}
#Add each specified recipient
$To | ForEach-Object {
$null = $message.ToRecipients.Add($_)
}
#Send the message and save a copy in the users Sent Items folder
try {
$message.SendAndSaveCopy()
}
catch [exception] {
Add-Content -Path $LOGFILE -Value "$_"
}
} # End Process
}

Answer 1

You may want to try the 2.0 assembly, though I don't think that is the issue http://www.microsoft.com/en-us/download/details.aspx?id=35371
My environment is a little different, in that our credentials and email address are not the same name. (one is initialLastName#Comp.com and the other is first.Last#Comp.com) so I have to be a little different in how I approach names, always needing a Credential and a MailBox name.
When I try to use a Resource account, I have to use my email for the autodiscovery. Possibly because the Service account doesn't have a user license. I am speculating.
I found a good amount of resources at http://gsexdev.blogspot.com/.
Specifically, this may be what you need:
## Optional section for Exchange Impersonation
# http://msdn.microsoft.com/en-us/library/exchange/dd633680(v=exchg.80).aspx
$service.ImpersonatedUserId = new-object Microsoft.Exchange.WebServices.Data.ImpersonatedUserId([Microsoft.Exchange.WebServices.Data.ConnectingIdType]::SmtpAddress, "SupportResource#comp.com")
#or clear with
#$service.ImpersonatedUserId = $null
similar 'discussion' # EWS Managed API: how to set From of email? also.