Active Directory Azure AD Microsoft 365 Windows Server

Import Microsoft 365 user to on premise Active Directory

This solves a frequent situation: you have an existing Microsoft 365 tenant with users that already are using it, and you want to set-up an Azure AD connect synchronization with an on premise Active directory.

This script will read the AAD user’s attributes, create a local user with matching attributes and set up a mS-DS-ConsistencyGuid attribute that allows Azure AD connect to synchronize the two users.

It is important to note that since we can’t know the AAD user’s password, a new one will need to be set through the script and will replicate to AAD.

    Script synchronizes a remote AzureAd users with a local Activedirectory users that it creates

    This script will get all attributes from office 365 and add them to a locally created user.
	It will then generate and add an mS-DS-ConsistencyGuid that will allow AzureADConnect to sync the remote and local user.
	User should be created in a non-synced OU and then copied over to a synchronized OU to allow for checks.
    A global admin is probably not required but at this stage I'm not sure what permission are actually needed.

    Requires module AzureAD and MSOnline

.Parameter usersContainer 
    OU where the user will be created

.Parameter userUPN 
    The UPN of the users we want to import

.Parameter userPassword 
    The password we want to user: password cannot be imported from AAD, so a new one must be set on import.
Param (
	[string] $usersContainer = "OU=Isotoit,OU=Building,OU=No-365,OU=Users,OU=XLG,DC=XLG,DC=grp",
	[string] $userUPN = "",
	[string] $userPassword = 'Qow65345@@'


$UserCredential = Get-Credential

#Install Module
Install-Module -Name AzureAD
Install-Module MSOnline
#Connect to Office 365 Azure AD
Connect-AzureAD -Credential $UserCredential
Connect-MsolService -Credential $UserCredential

#Add UPN suffixes to local ad
$azureDomains = Get-AzureADDomain
$localForest = (get-addomain).Forest
ForEach($domain in $azureDomains)
    if($domain.Name -notlike "*")
        Set-ADForest -Identity $localForest -UPNSuffixes @{Add=($domain).Name}

function convert-guid {

  $bytearray = $guidtoconvert.ToByteArray()
  $immutableID = [System.Convert]::ToBase64String($bytearray)

function Add-LocalADObject
    ForEach($object in $input)
        write-host $object.ObjectType $object.DisplayName
        if($object.UserPrincipalName -like "*")
            write-host "Skipping object " $object.DisplayName "because it does not have a custom logon domain"
        if($object.ObjectType -eq "User")
            $userName, $upn = $object.UserPrincipalName.split('@')
            $upn = "@"+$upn
            New-ADUser -SamAccountName $userName -UserPrincipalName $object.UserPrincipalName -Name $object.DisplayName -DisplayName $object.DisplayName -Path $usersContainer -AccountPassword (ConvertTo-SecureString $userPassword -AsPlainText -Force) -Enabled $True -PassThru
            $filter = "CN=" + $object.DisplayName
        $localADObject = Get-ADObject -Filter "UserPrincipalName -eq '$($userUPN)'"
        #Update attributes based on Azure contact
        if($object.GivenName -ne $null){ Set-ADObject $localADObject -Add @{givenName=$object.GivenName}  }
        if($object.Surname -ne $null){ Set-ADObject $localADObject -Add @{sn=$object.Surname}  }
        if($object.Mail -ne $null){ Set-ADObject $localADObject -Add @{mail=$object.Mail}  }
        if($object.StreetAddress -ne $null){ Set-ADObject $localADObject -Add @{streetAddress=$object.StreetAddress} }
        if($object.PostalCode -ne $null){ Set-ADObject $localADObject -Add @{postalCode=$object.PostalCode} }
        if($object.City -ne $null){ Set-ADObject $localADObject -Add @{l=$object.City} }
        if($object.State -ne $null){ Set-ADObject $localADObject -Add @{st=$object.State} }
        if($object.PhysicalDeliveryOfficeName -ne $null){ Set-ADObject $localADObject -Add @{physicalDeliveryOfficeName=$object.PhysicalDeliveryOfficeName} }
        if($object.TelephoneNumber -ne $null){ Set-ADObject $localADObject -Add @{telephoneNumber=$object.TelephoneNumber} }
        if($object.FacsimilieTelephoneNumber -ne $null){ Set-ADObject $localADObject -Add @{facsimileTelephoneNumber=$object.FacsimilieTelephoneNumber} }
        if($object.Mobile -ne $null){ Set-ADObject $localADObject -Add @{mobile=$object.Mobile} }
        if($object.JobTitle -ne $null){ Set-ADObject $localADObject -Add @{title=$object.JobTitle} }
        if($object.Department -ne $null){ Set-ADObject $localADObject -Add @{department=$object.Department} }
        if($object.CompanyName -ne $null){ Set-ADObject $localADObject -Add @{company=$object.CompanyName} }
		if($object.Country -ne $null){ Set-ADObject $localADObject -Add @{c="BE"} }
		if($object.MailNickName -ne $null){ Set-ADObject $localADObject -Add @{MailNickName=$object.MailNickName} }
		if($object.PreferredLanguage -ne $null){ Set-ADObject $localADObject -Add @{PreferredLanguage=$object.PreferredLanguage} }
		Set-ADObject $localADObject -Add @{msExchPoliciesExcluded="{26491cfc-9e50-4857-861b-0cb8df22b5d7}"}
        #get proxy addresses
        if($object.ProxyAddresses -ne $null)
            ForEach($proxyAddress in $object.ProxyAddresses)
                Set-ADObject -identity $localADObject -Add @{ProxyAddresses=$proxyAddress}
#Add users to local AD
if (!(Get-ADUser -Filter "userPrincipalName -like '$userUPN'"))
	Get-AzureADUser -ObjectId $userUPN | Add-LocalADObject
$user = Get-ADUser -Filter "userPrincipalName -like '$userUPN'"
$immutableID = convert-guid -guidtoconvert $user.objectguid
Set-MsolUser -UserPrincipalName $userUPN -ImmutableId $immutableID
$decodedII = [system.convert]::frombase64string($ImmutableId)
$decode = [GUID]$decodedii
$ImmutableId = $decode
$user | Set-ADUser -Replace @{'mS-DS-ConsistencyGuid'=$($ImmutableId)}


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