Similar SAML requests blocked issue

[debugger]

I read "[Resolved] SAML requests blocked" viewtopic.php?f=7&t=26677 which in the end solved my problem.

I navigated to our internal company page, which redirects to https://login.microsoftonline.com for SAML authentication after 2-Factor authentication it redirect back to the internal company page - this last step fails.

The SAML request to the internal page uses the following headers and is cross domain (obviously):

• Fetch-Dest: document
  Sec-Fetch-Mode: navigate
  Sec-Fetch-Site: same-origin

The reason for me turned out to be that I applied the following settings for https://login.microsoftonline.com

• Enable these capabilities when top page matches: ...microsoftonline.com
  script
  frame
  fetch
  noscript
  lan

After reverting it to:

• Enable these capabilities when top page matches: ANY
  script
  frame
  fetch
  noscript
  lan

A better error message in the debug console CTRL+I of Firefox would have helped me to understand WHY the SAML-request was blocked.