Find microsoft teams organization wide with guests included

The estimated reading time 3 minutes

Find microsoft teams organization wide with guests included

Some may have read my previous article about finding guests in teams, see link.

Unfortunately, with the “normal” teams cmdlets only user-based queries can be dropped, so if my user is not a member of the team, then I also do not find the O365 group.
So I looked for another solution. In the internet I quickly found this link.

It took me a long way, but now I had to rebuild and adapt my complete script because I no longer want to work with get-team (which does not mean it’s bad).

Of course, before the script can be executed, it must be connected to Exchange Online. Also, the teams cmdlets are loaded and connected. See link

The script works only in the ISE environment!

Connect to the Online Services.

$UserCredential = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
Import-PSSession $Session
Import-Module MicrosoftTeams
Connect-MicrosoftTeams -Credential $UserCredential

script

#
    .SYNOPSIS
 
    script to find all ms teams group with guest accounts
 
    .DESCRIPTION
    
 
 
    .EXAMPLE
    no parameters needed 
 
    .Notes
    connect to exchange online first, delet the # at the beginnig of the scripts 
    https://technet.microsoft.com/en-us/library/jj984289(v=exchg.160).aspx
    
   
    ---------------------------------------------------------------------------------
                                                                                 
    Script:       get-allteams-with-guest-0-2.ps1                                      
    Author:       A. Koehler; blog.it-koehler.com
    ModifyDate:   04/07/2018                                                        
    Usage:        identify all teams groups in office 365 and get guests
    Version:      0.2
                                                                                  
    ---------------------------------------------------------------------------------
#>
### start connection to exchange online and ms teams 
# Set-ExecutionPolicy RemoteSigned
# $UserCredential = Get-Credential
# $Session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://outlook.office365.com/powershell-liveid/ -Credential $UserCredential -Authentication Basic -AllowRedirection
# Import-PSSession $Session
# Import-Module MicrosoftTeams
# Connect-MicrosoftTeams -Credential $UserCredential
#####################################################################################################

#get all o365 groups from exchange online
$o365groups = Get-UnifiedGroup -ResultSize unlimited
#generate array
$externalteams = @()
$output = @()
foreach ($o365group in $o365groups) {
  try {
    $teamschannels = Get-TeamChannel -GroupId $o365group.ExternalDirectoryObjectId 
    $output += [pscustomobject]@{GroupId = $o365group.ExternalDirectoryObjectId; GroupName = $o365group.DisplayName; TeamsEnabled = $true} 
  } catch {
    $ErrorCode = $_.Exception.ErrorCode
    switch ($ErrorCode) {
      "404" {
        $output += [pscustomobject]@{GroupId = $o365group.ExternalDirectoryObjectId; GroupName = $o365group.DisplayName; TeamsEnabled = $false}
        break;
      }
      "403" {
        $output += [pscustomobject]@{GroupId = $o365group.ExternalDirectoryObjectId; GroupName = $o365group.DisplayName; TeamsEnabled = $true} 
        break;
      }
      default {
        Write-Error ("Unknown ErrorCode trying to 'Get-TeamChannel -GroupId {0}' :: {1}" -f $o365group, $ErrorCode)
      }
    }
  }
} 

#search for teamenabled groups
$teams = $output | Where-Object{$_.TeamsEnabled -eq $true}
#count teams
$number = $teams.Count
#check if there are teams enabled groups available
if($number -eq "0"){
  Write-host "there are no teams in your organization" -ForegroundColor yellow
 }
else{
  #go through every team and search for external users
  foreach ($team in $teams){
    #get groupid of the team 
    $groupid = ($team.groupid)
    #search external users 
    $users = (Get-UnifiedGroup -Identity $groupid | Get-UnifiedGroupLinks -LinkType Members | Where-Object {$_.Name -like "*#EXT#*"})
    #count external users
    $extcount = ($users.count)
    #go through every team an put teamname and teammembers in custom object
    foreach ($extuser in $users){
      #get displayname from team
      $teamext = (($o365groups | Where-Object {$_.ExternalDirectoryObjectId -eq "$groupid"}).DisplayName).ToString()
      $teamextcreatedate = (($o365groups | Where-Object {$_.ExternalDirectoryObjectId -eq "$groupid"}).WhenCreated).ToString()
      #get the external users 
      $ext = $extuser.Name
      #create custom object
      $externalteams += [pscustomobject]@{
        ExtUser   = $ext
        TeamName  = $teamext
        TeamsCreationDate = $teamextcreatedate
        GroupID   = $groupid
       } 
      }
     }
  #check if there are some teams with external users or not 
  if ($extcount -eq "0"){
    Write-host "there are no external user added to any team in your organization" -ForegroundColor yellow
    
    }
  else{
    #show custom object in powershell
    $externalteams | Out-GridView -Title "external members in Teams"
    <#
        $Header = @"
        <style>
        TABLE {border-width: 1px; border-style: solid; border-color: black; border-collapse: collapse;}
        TD {border-width: 1px; padding: 3px; border-style: solid; border-color: black;}
        </style>
        "@
        $externalteams | ConvertTo-Html -Property ExtUser,TeamName,GroupID -Head $Header | Out-File -FilePath .\msteam-guests.html
        Invoke-Expression ".\msteam-guests.html"
    #>
   
  }
}