Hey there @margyly!
Sorry for such delayed response but it must have hidden somewhere in the December madness of topics coming in. I reached out to the person that seems to be taking care of our Drupal stack (https://github.com/auth0/auth0-drupal) and discussed that and it seems like by checking those two boxes should perform double verification but if you had a chance to test it out it would be great if you can actually confirm that! Thank you!