This is a well-known bug with ADAL.js that I've personally struggled with on our own corporate sites. It's a library that enables OAuth integration with Azure

This is a well-known bug with ADAL.js that I've personally struggled with on our own corporate sites. It's a library that enables OAuth integration with Azure AD for single-page apps. Switching browsers can fix it. If they're using MSAL instead, it's possible that copying the link and pasting it into a new window will fix it as well...