Powershell function to connect to Intune Graph API

Connect-Intune.ps1

#You need AzureAD Module (Save-Module AzureAD -Path C:\temp)
#You need Function Get-GraphAuthHeaderBasedOnUPN @ https://gist.github.com/poiriersimon/ded7cdca600ba0aab84b75b7f47c1235
Function Connect-Intune{
    param
(
    [Parameter(Mandatory = $True)]
    [string]$Tenant,
    [Parameter(Mandatory = $True)]
    [string]$UserPrincipalName,
    [string]$clientId = "d1ddf0e4-d672-4dae-b554-9d5bdfd93547",
    [string]$redirectUri = "urn:ietf:wg:oauth:2.0:oob",
    [string]$resourceAppIdURI = "https://graph.microsoft.com",
    [string]$AzureADPowershellModuleDir = "C:\Temp\AzureAD"
)
    #Connect to Intune Graph API
    # Checking if authToken exists before running authentication
    if($Global:authToken){
        # Setting DateTime to Universal time to work in all timezones
        $DateTime = (Get-Date).ToUniversalTime()

        # If the authToken exists checking when it expires
        $TokenExpires = ($Global:authToken.ExpiresOn.datetime - $DateTime).Minutes

            if($TokenExpires -le 0){

            write-host "Authentication Token expired" $TokenExpires "minutes ago" -ForegroundColor Yellow
            $Global:authToken = Get-GraphAuthHeaderBasedOnUPN -Tenant $Tenant -UserPrincipalName $UserPrincipalName -clientId $clientId -redirectUri $redirectUri -resourceAppIdURI $resourceAppIdURI -AzureADPowershellModuleDir $AzureADPowershellModuleDir -verbose:$Verbose
            }
    }
    # Authentication doesn't exist, calling Get-GraphAuthHeaderBasedOnUPN function
    else {
        $Global:authToken = Get-GraphAuthHeaderBasedOnUPN -Tenant $Tenant -UserPrincipalName $UserPrincipalName -clientId $clientId -redirectUri $redirectUri -resourceAppIdURI $resourceAppIdURI -AzureADPowershellModuleDir $AzureADPowershellModuleDir -verbose:$Verbose
    }
    $Global:authToken
}