The login screen of the Search app continues to load

This problem can occur when ADFS is used.

You can solve this by adjusting the authentication on the ADFS server;

• If not already done, run the Powershell script below:
  
  Set-AdfsGlobalAuthenticationPolicy -WindowsIntegratedFallbackEnabled $ true
  
• Now go to the adfs settings, open the authentication methods and then click edit.
  

  

• Make sure that forms authentication is enabled for extranet, and make sure that both forms authentication and windows authentication are enabled for intranet.
  

  

When the above is set correctly, the login should function again.