Azure AD B2B custom email invite from CSV script

#From https://eschrader.com/2017/06/12/sharepoint-online-azure-ad-b2b-custom-email-invites-for-users-using-powershell/
#1.) Install Azure AD PS module – https://www.powershellgallery.com/packages/AzureADPreview
#Install-Module -Name AzureADPreview

#2.) provide O365 tenant admin cred

$cred = Get-Credential

Connect-AzureAD -Credential $cred

#2.a) second cred for O365 email account (merge var with above if for non-demo O365 tenant)

$adminemailcred = get-credential


#2.b) External User Security Group ID
#get-azureadgroup | where-object {$_.DisplayName -ilike "External Users"}
$groupID = "c9a04711-e307-4370-af42-f48db58f80c5"

#3.) import CSV, update url and csv location below.

$invitations = import-csv C:\azure_ad_b2b.csv

foreach ($email in $invitations) {
    #loop over each user in the CSV and create an invite for that user but does not email the user
    $result= New-AzureADMSInvitation -InvitedUserEmailAddress $email.InvitedUserEmailAddress -InvitedUserDisplayName $email.Name -InviteRedirectUrl https://eschrader.sharepoint.com/sites/extranet -InvitedUserMessageInfo $messageInfo -SendInvitationMessage $false
    $inviteurl = $result.InviteRedeemUrl
    $userid = $result.InvitedUser.Id

    #automatically add the new user to your Security Group
    Add-AzureADGroupMember -ObjectId $groupID -RefObjectId $userid

    #send the user a custom email from your Office 365 tenant. Supports HTML.


    #Configuration variables for Email
    $EmailTo = $result.InvitedUserEmailAddress
    $EmailFrom = "Eric Schrader <eric@eschradrr.onmicrosoft.com>"
    $EmailSubject = "INVITE: Eschrader Extranet"
    $SupportEmail = "support@eschradrrr.com"
    $SmtpServer = "smtp.office365.com"
    $InviteUrl = $inviteurl
    $DisplayName = $result.Name

    #HTML Template
    $EmailBody = @"

    <header>
        <img src="https://ericschrader.files.wordpress.com/2017/05/sileo-logo.png" />
    </header>

    <div>
      <p style="margin-top:20px;">Congrats $DisplayName,</p>

      <p>
        You have been invited to access the Eschrader extranet.
      </p>
      <p>
        <div><a href="$InviteUrl">Sign Up</a></div>
      </p>
      <p>
        If you need further assistance, please contact us <a href="mailto:$SupportEmail">$SupportEmail</a>
      </p>
    </div>

    "@

    Send-MailMessage -To $EmailTo -from $EmailFrom -Subject $EmailSubject -Body $EmailBody -BodyAsHtml -smtpserver $SmtpServer -usessl -Credential $adminemailcred -Port 587
}