SyncOutlookContactsToTeamsContacts.ps1

$teamsRegion = Read-Host "Enter your Teams region. E.g. 'emea'"

function Get-UserToken {
    param (
    )

    # Tenant name or id
    $tenantName = Read-Host "Enter your primary M365 domain or *.onmicrosoft.com name."

    Add-Type -AssemblyName System.Web
    $WebResource = "https://teams.microsoft.com/"
    $redirectUrl = "https://teams.microsoft.com/go"
    $client_id = "5e3ce6c0-2b1f-4285-8d4b-75ee78787346"
    $scope = "48ac35b8-9aa8-4d74-927d-1f4a14a0b239%2F.default%20openid%20profile"
    $nonce = [guid]::NewGuid().GUID
    $url = "https://login.microsoftonline.com/$tenantName/oauth2/authorize?response_type=token&scope=$scope&redirect_uri=" +
    [System.Web.HttpUtility]::UrlEncode($redirectUrl) +
    "&client_id=$client_id" +
    "&prompt=login" + "&nonce=$nonce" + "&resource=" + [System.Web.HttpUtility]::UrlEncode($WebResource) + "&state=12345" #here
    Add-Type -AssemblyName System.Windows.Forms
    $form = New-Object -TypeName System.Windows.Forms.Form -Property @{ Width = 440; Height = 640 }
    $web = New-Object -TypeName System.Windows.Forms.WebBrowser -Property @{ Width = 420; Height = 600; Url = ($url) }
    $DocComp = {
    $Global:uri = $web.Url.AbsoluteUri
    if ($Global:Uri -match "error=[^&]*|access_token=[^&]*") { $form.Close() }
    }
    $web.ScriptErrorsSuppressed = $true
    $web.Add_DocumentCompleted($DocComp)
    $form.Controls.Add($web)
    $form.Text = "AAD User Login"
    $form.Add_Shown({ $form.Activate() })
    $form.ShowDialog() | Out-Null
    $Script:Token = [Web.HttpUtility]::ParseQueryString(($web.Url -replace '^.*?(access_token.+)$','$1'))['access_token']
    $AADBearerToken = ('Bearer {0}' -f $Script:Token)

    $Headers = @{
        Authorization = $AADBearerToken
    }

}

function Get-Buddies {
    param (
    )

    $URL = "https://teams.microsoft.com/api/mt/$teamsRegion/beta/contacts/buddylist/"

    $ListID = ((Invoke-RestMethod -Uri $URL  -Method GET -Headers $Headers -ContentType "application/json").value | Where-Object{$_.displayname -like "OtherContacts"}).id


    $URL = "https://teams.microsoft.com/api/mt/$teamsRegion/beta/contacts/buddylist/$ListID"

    $buddies = Invoke-RestMethod -Uri $URL -Method GET -Headers $Headers -ContentType "application/json"
    
}

$outlook= NEW-OBJECT -ComObject Outlook.Application
$contacts = $Outlook.session.GetDefaultFolder(10).items

$allTeamsContactDetails = @()

foreach ($contact in $Contacts) {


    $contactNumbers = $contact.psobject.Properties | Where-Object {$_.Name -match "TelephoneNumber" -and $_.Value -notlike ""}

    foreach ($number in $contactNumbers) {

        $contactDetails = NEW-OBJECT -TypeName psobject

        $contactDetails | Add-Member -MemberType NoteProperty -Name "FullName" -Value "$($contact.FirstName) $($contact.LastName)"
        $contactDetails | Add-Member -MemberType NoteProperty -Name "CompanyName" -Value $contact.CompanyName
        $contactDetails | Add-Member -MemberType NoteProperty -Name "JobTitle" -Value $contact.JobTitle

        if ($contactDetails.CompanyName) {

            $contactDetails.CompanyName = $contactDetails.CompanyName.Replace("(","").Replace(")","")

        }

        if ($contactDetails.JobTitle) {

            $contactDetails.JobTitle = $contactDetails.JobTitle.Replace("(","").Replace(")","")

        }

        if (!$contactDetails.FullName) {

            $contactDetails.FullName = $contactDetails.CompanyName
    
        }

        $contactDetails.FullName = $contactDetails.FullName.Replace("(","").Replace(")","").Trim()

        $phoneNumber = $number.Value.Replace(" ","").Replace("-","").Replace("(0)","")

        $contactDetails | Add-Member -MemberType NoteProperty -Name "PhoneNumber" -Value $phoneNumber

        $numberType = $number.Name.Replace("TelephoneNumber","")

        $contactDetails.FullName = "$($contactDetails.FullName) [$numberType]"
    
        $allTeamsContactDetails += $contactDetails

    }

}

. Get-UserToken

. Get-Buddies

$existingBuddies = $buddies.value.buddies

$addBuddiesURL = "https://teams.microsoft.com/api/mt/$teamsRegion/beta/contacts/buddylist/$ListID/managebuddies?migrationRequested=true&federatedContactsSupported=true"

foreach ($contact in $allTeamsContactDetails) {

    $contact

    Start-Sleep 1

    if ($existingBuddies.mri.Replace("4:","") -notcontains $contact.PhoneNumber -or $existingBuddies.displayName -notcontains $contact.FullName) {

        Write-Host "No Teams contact found for $($contact.FullName) or $($contact.PhoneNumber)" -ForegroundColor Green


        $payload = @"
{"add":[{"mri":"4:$($Contact.PhoneNumber)","displayName":"$($Contact.FullName)","phone":"$($Contact.PhoneNumber)","companyName":"$($Contact.CompanyName)","jobTitle":"$($Contact.JobTitle)"}]}
"@

        Invoke-RestMethod -Uri $addBuddiesURL -Body $payload -Method Post -Headers $Headers -ContentType "application/json; charset=utf-8"
    
    }

    else {

        Write-Host "Teams contact for $($contact.FullName) or $($contact.PhoneNumber) already exists" -ForegroundColor Yellow

    }

}