I have a Drupal 9 website that uses SimpleSAMLPHP for SSO with MS ADFS. Now I want to convert this website to decoupled architecture and would like to create some pages in Angular and the rest of the site will remain the same. Drupal will serve as the backend for these Angular pages.
In the above scenario what approach should I take. When a user hits a page created using Angular, how should I authenticate that user using SSO.