I am able to send the email with the options but when I select the option I want (Approve/Reject) there is no reply.

Office365Outlook.SendMailWithOptions("https://www.outlook.com", 
    { 
       To: "[email protected]", 
        Subject: "This Is My Options Email Title", 
        Options: "Approve,Reject", 
        HeaderText:"Approval Selection", 
        SelectionText: "Please select 'Approve' or 'Reject' for the new tool", 
        Body: "See attached the new tool approval request", 
        Importance: "Low", 
        Attachments:Blank(), 
        UseOnlyHTMLMessage: true, 
        HideHTMLMessage: true, 
        HideMicrosoftFooter: true, 
        ShowHTMLConfirmationDialog: true 
    }
);