title: KQL search return System.UnauthorizedAccessException
body: <p>I'm using kql to search files in a sharepoint online using CSOM in a sharepoint add-in. It works so far until 29th january 2021
  I noticed that using the method new sharepointonlinecredential, passing username and password works.
  I get the context using the tokenhelper class with GetClientContextWithAccessToken (suggested method for authenticate sharepoint add-in).
  Could you help me?</p>