Adding B2B guests and adding to security group

Tim_Opie 

Hello!

From what I can see, the issue is likely related to the fact that the Add-AzureADGroupMember command is running outside of the foreach loop. This means that it's trying to add the user to the group using the last value of $email.Name, which is likely not what you intended.

To fix this, you should move the Add-AzureADGroupMember command inside the foreach loop, like this:

$invitations = import-csv C:\B2BUploads\Test.csv

$messageInfo = New-Object Microsoft.Open.MSGraph.Model.InvitedUserMessageInfo
$messageInfo.customizedMessageBody = "Welcome message"

$GroupID = ((Get-AzureADGroup -Filter "Displayname eq 'Test'").ObjectID)

foreach ($email in $invitations) {
    New-AzureADMSInvitation `
        -InvitedUserEmailAddress $email.InvitedUserEmailAddress `
        -InvitedUserDisplayName $email.Name `
        -InviteRedirectUrl https://sharepoint site here `
        -InvitedUserMessageInfo $messageInfo `
        -SendInvitationMessage $true

    Add-AzureADGroupMember `
        -ObjectId $GroupID `
        -RefObjectID ((Get-AzureAdUser -All $true | Where-Object {$_.DisplayName -in $email.Name}).ObjectID)
}

This should ensure that the Add-AzureADGroupMember command is run once for each email address in the CSV file, using the correct value of $email.Name each time.