GetAllAzureADUsersGroupsContacts.ps1

# Adding the AD AuthN library to your PowerShell Session.
# the default path to where the ADAL GraphAPI PS Module puts the Libs
Add-Type -Path 'C:\Program Files\WindowsPowerShell\Modules\AzureADPreview\1.1.143.0\Microsoft.IdentityModel.Clients.ActiveDirectory.dll'

# Your Azure tenant name 
$tenantID = "mydomain.com.au"
$authString = "https://login.microsoftonline.com/$tenantID" 

# username and password. The username must be MFA disabled user Admin at least, and must not be a live id.
$username = "doc@mydomain.com.au"
$password = "S3cretSqu1rr3l"

# The resource URI for your token.
$resource = "https://graph.windows.net/"

# Object Type (eg. Users, Groups, Contacts)
$object = "users"

# This is the powershell common client id.
$client_id = "1950a258-227b-4e31-a9cf-717495945fc2"

# Create a client credential with the above common client id, username and password.
$creds = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.UserCredential" `
                    -ArgumentList $username,$password

# Create a authentication context with the above authentication string.
$authContext = New-Object "Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext" `
                    -ArgumentList $authString

# Acquire access token from server.
$authenticationResult = $authContext.AcquireToken($resource,$client_id,$creds)

# Use the access token to setup headers for your http request.
$authHeader = $authenticationResult.AccessTokenType + " " + $authenticationResult.AccessToken
$headers = @{"Authorization"=$authHeader; "Content-Type"="application/json"}

# URI to get first 999 objects
$url = "https://graph.windows.net/{0}/$($object)?`$top=999&api-version=1.6"
# URI to page remainder of objects
$url2 = "$resource$tenantId/"

# Get the first 999 objects        
$query = Invoke-RestMethod -Method Get -Headers @{
    Authorization   = $authenticationResult.CreateAuthorizationHeader()
    'Content-Type'  = "application/json"
} -Uri ($url -f $authenticationResult.TenantId)

# An Array for the retuned objects to go into 
$tenantObjects = @()
# Add in our first 999 objects
$tenantObjects += $query.value
$moreObjects = $query 
$query.value.Count
 
# Get all the remaining objects in 999 batches
if ($query.'odata.nextLink'){
    $moreObjects.'odata.nextLink' = $query.'odata.nextLink'
    do
        {
            $moreObjects = Invoke-RestMethod -Method Get -Headers @{
            Authorization   = $authenticationResult.CreateAuthorizationHeader()
            'Content-Type'  = "application/json"
            } -Uri ($url2+$moreObjects.'odata.nextLink'+'&$top=999&api-version=1.6' -f $authenticationResult.TenantId)
            $moreObjects.value.count
            $tenantObjects += $moreObjects.value
            $tenantObjects.Count

        } while ($moreObjects.'odata.nextLink')
}

$tenantObjects.Count
$tenantObjects | Out-GridView