your_page_name_blocking_access_while_2FA_not_approved.htm

<!DOCTYPE html>

<html>
 <head>
  <title>your_title_name</title>
 </head>
 <body>

 <center>

  <img src="duo.png" width="10%" height="10%">

  <h1> Your current user session don't have valid authorized token (second factor) from your authenticator application </h1>
  <h3> Please, provide your own personal code (second factor) from your authenticator application for access application resource </h3>

 </center>

 </body>
</html>