F5 or refresh page gives a token error when using an Iframe with a one span URL

One of our customer is using a Iframe with one span sign URL embedded in .net 5 mvc web application. The problem is that if a user refresh the page they get an error access unauthorized your authentication token is incorrect. "Accès non autorisé. Votre jeton d'authentification a été incorrect." When they look at the token before and after the post, the 2 tokens are the same with the same URL https://sandbox.esignlive.com/access?sessionToken=... They were looking at implementing some JavaScript code to prevent the F5 or refresh button from happening.