I have developed the application in SharePoint online(Modern Team Site). My client want the sharepoint site to be rendered in Iframe of his public facing html website. So that users can login and see the website under his public facing website. I am not able to implement this as it throws "X-Frame-options" error. I understand this is something very rare requirement, specially when it comes to public facing site interaction with sharepoint. Does somebody have any solution to this problem.?