Get-AADUsersManagersGraph.ps1

#region Get Access token from Grap Explore Session
$accessToken = #Get the AccessTokenquick & Dirty using developers tool trick by Dan Silver https://twitter.com/dansilver82/status/872520061843415040 
#endregion

#region Format request Header
$requestHeader = @{
    "Authorization" = "Bearer " + $accessToken   #For now get AccessToken from Developers tools console
    "Content-Type"  = "application/json"
}
#endregion

#region Get Users Tenant properties to query with Graph
$userProperties = @(
    'displayName'
    'GivenName'
    'surName'
    'department'
    'officeLocation'
    'jobTitle'
    'userPrincipalName'
    'id'
)

$iwrUsersParams = @{
    Uri     = "https://graph.microsoft.com/v1.0/users?`$select=$($userProperties -join ',')"
    Method  = 'Get'
    Headers = $requestHeader
}

$iwrUsersResults = Invoke-WebRequest @iwrUsersParams
$iwrUsersObjects = $iwrUsersResults.Content | ConvertFrom-Json

$iwrUsersObjects.value
#endregion

#region Get Manager per Object ID
$iwrUsersObjects.value | 
    ForEach-Object {
    try {
        $obj = $_
        $iwrManagerParams = @{
            Uri     = 'https://graph.microsoft.com/v1.0/users/{0}/manager' -f $obj.ID
            Method  = 'Get'
            Headers = $requestHeader
        }
        $userManager = Invoke-WebRequest @iwrManagerParams
        $iwrManagerObject = $userManager.Content | ConvertFrom-Json
    
        [PSCustomObject]@{
            ObjectID          = $obj.Id
            UserPrincipalName = $obj.userPrincipalName
            DisplayName       = $obj.DisplayName
            GivenName         = $obj.givenName
            SurName           = $obj.surname
            JobTitle          = $obj.jobTitle
            Department        = $obj.department
            Manager           = $iwrManagerObject.displayName

        }
    }
    Catch {
        [PSCustomObject]@{
            ObjectID          = $obj.Id
            UserPrincipalName = $obj.userPrincipalName
            DisplayName       = $obj.DisplayName
            GivenName         = $obj.givenName
            SurName           = $obj.surname
            JobTitle          = $obj.jobTitle
            Department        = $obj.department
            Manager           = $null

        }
    }
}
#endregion

Get-AADUsersManagersGraphBeta.ps1

#region Get Access token from Grap Explore Session
$accessToken = $null
#endregion

#region Format request Header
$requestHeader = @{
    "Authorization" = "Bearer " + $Accesstoken   #For now get AccessToken from Developers tools console
    "Content-Type"  = "application/json"
}
#endregion

$iwrUsersParams = @{
    Uri     = "https://graph.microsoft.com/beta/users?`$expand=Manager"
    Method  = 'Get'
    Headers = $requestHeader
}

$iwmUserResults = Invoke-RestMethod @iwrUsersParams
$iwmUserResults.value | 
    ForEach-Object {
    [PSCustomObject]@{
        DisplayName = $_.displayname
        GivenName   = $_.givenname
        SurName     = $_.surname
        JobTitle    = $_.jobtitle
        Department  = $_.department
        Manager     = $_.manager.displayname
    }
}