Connect-GraphRefresh.ps1

function Connect-GraphRefresh {
    [CmdletBinding()]
    param (

    )

    if (-not $Delegated) {
        Connect-Graph -Tenant $Script:Tenant -Workload $Script:Workload -Delegated:$Script:Delegated
    }
    else {
        $Request = @{
            Method = 'POST'
            Body   = @{
                Grant_Type    = 'refresh_token'
                Client_Id     = $Script:Config.ClientId
                Client_Secret = $Script:Config.cred.GetNetworkCredential().password
                Username      = $Script:cred.UserName
                Password      = $Script:cred.GetNetworkCredential().password
                refresh_token = $Script:RefreshToken
                Scope         = "offline_access https://graph.microsoft.com/.default"
            }
            Uri    = "https://login.microsoftonline.com/$Script:Tenant.onmicrosoft.com/oauth2/v2.0/token"
        }

        $Response = Invoke-RestMethod @Request

        $Script:RefreshTime = ([datetime]::UtcNow).AddSeconds($Response.expires_in - 10)
        $Script:Token = $Response.access_token
    }
}