Scripting/Powershell/PowerShell-collection/AzureAD/Get-AzureADUserDevices.ps1

#requires -Version 3.0 -Modules AzureAD

<#
      .SYNOPSIS
      Script to monitor and return large number of user devices in Azure Active Directory.

      .DESCRIPTION
      Script to monitor and return large number of user devices in Active Directory.
      The default limit in Azure is 20 devices

      .PARAMETER All
      If true, return all users.

      .PARAMETER HighDeviceCount
      Enter the threshold for devices that you want to return

      .EXAMPLE
      Get-AzureADUserDevices.ps1 -HighDeviceCount 15 -All $true

      .EXAMPLE
      Get-AzureADUserDevices.ps1 -HighDeviceCount 5 -All $true

      .NOTES
      Reworked version of Ben Whitmore Get-UserDevices that use the AzureAD module instead of the MsolService module

      .LINK
      https://github.com/byteben/AzureAD/blob/master/Get-UserDevices.ps1
#>
[CmdletBinding(ConfirmImpact = 'None')]
param
(
   [Parameter(ValueFromPipeline,
      ValueFromPipelineByPropertyName,
      Position = 0)]
   [ValidateNotNullOrEmpty()]
   [int]
   $HighDeviceCount = 15,
   [Parameter(ValueFromPipeline,
      ValueFromPipelineByPropertyName,
      Position = 1)]
   [bool]
   $All
)

begin
{
   # Defaults
   $STP = 'Stop'

   # Set some default
   if (-not ($HighDeviceCount))
   {
      $HighDeviceCount = 15
   }

   # Connect to Azure Active Directory, if needed
   if ($AzureActiveDirectoryConnection.Account -eq $null)
   {
      try
      {
         $Global:AzureActiveDirectoryConnection = (Connect-AzureAD -ErrorAction $STP)
      }
      catch
      {
         #region ErrorHandler
         # get error record
         [Management.Automation.ErrorRecord]$e = $_

         # retrieve information about runtime error
         $info = [PSCustomObject]@{
            Exception = $e.Exception.Message
            Reason    = $e.CategoryInfo.Reason
            Target    = $e.CategoryInfo.TargetName
            Script    = $e.InvocationInfo.ScriptName
            Line      = $e.InvocationInfo.ScriptLineNumber
            Column    = $e.InvocationInfo.OffsetInLine
         }

         $info | Out-String | Write-Verbose

         Write-Error -Message ($info.Exception) -ErrorAction $STP

         # Only here to catch a global ErrorAction overwrite
         break
         #endregion ErrorHandler
      }
   }

   # Initialize Array to hold users and number of devices
   $DeviceCountHigh = @()

   try
   {
      # Splatting
      $paramGetAzureADUser = @{
         filter      = "userType eq 'Member'"
         All         = $All
         ErrorAction = $STP
      }

      # Get list of users from Azure Active Directory
      $Users = (Get-AzureADUser @paramGetAzureADUser | Select-Object -Property UserPrincipalName, ObjectId)

      # Splatting
      $paramGetAzureADDevice = @{
         All         = $true
         ErrorAction = $STP
      }

      # Get a list of Devices and the ownership information from the Azure Active Directory
      $Devices = (Get-AzureADDevice @paramGetAzureADDevice | Get-AzureADDeviceRegisteredOwner -ErrorAction $STP)
   }
   catch
   {
      #region ErrorHandler
      # get error record
      [Management.Automation.ErrorRecord]$e = $_

      # retrieve information about runtime error
      $info = @{
         Exception = $e.Exception.Message
         Reason    = $e.CategoryInfo.Reason
         Target    = $e.CategoryInfo.TargetName
         Script    = $e.InvocationInfo.ScriptName
         Line      = $e.InvocationInfo.ScriptLineNumber
         Column    = $e.InvocationInfo.OffsetInLine
      }

      $info | Out-String | Write-Verbose

      Write-Error -Message ($info.Exception) -ErrorAction $STP

      # Only here to catch a global ErrorAction overwrite
      break
      #endregion ErrorHandler
   }
}

process
{
   foreach ($User in $Users)
   {
      # For each user returned, count their Registered Devices
      $Device = ($Devices | Where-Object {
            $_.UserPrincipalName -eq $User.UserPrincipalName
         } | Measure-Object)

      # If the number of registered devices measured is high, create a new PSObject
      if ($Device.Count -ge $HighDeviceCount)
      {
         # Create a new PSObject
         $DeviceCountMember = @()

         # Fill the values
         $DeviceCountMember = (New-Object -TypeName PSObject)
         $DeviceCountMember | Add-Member -MemberType NoteProperty -Name 'UserPrincipalName' -Value $User.UserPrincipalName
         $DeviceCountMember | Add-Member -MemberType NoteProperty -Name 'DeviceCount' -Value $Device.Count

         # Add to the PSObject
         $DeviceCountHigh += $DeviceCountMember
      }
   }
}

end
{
   # Display Users with high number of devices
   $DeviceCountHigh | Sort-Object -Property DeviceCount -Descending
}

#region LICENSE
<#
   BSD 3-Clause License

   Copyright (c) 2021, enabling Technology
   All rights reserved.

   Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
   3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#>
#endregion LICENSE

#region DISCLAIMER
<#
   DISCLAIMER:
   - Use at your own risk, etc.
   - This is open-source software, if you find an issue try to fix it yourself. There is no support and/or warranty in any kind
   - This is a third-party Software
   - The developer of this Software is NOT sponsored by or affiliated with Microsoft Corp (MSFT) or any of its subsidiaries in any way
   - The Software is not supported by Microsoft Corp (MSFT)
   - By using the Software, you agree to the License, Terms, and any Conditions declared and described above
   - If you disagree with any of the terms, and any conditions declared: Just delete it and build your own solution
#>
#endregion DISCLAIMER