Zscaler blocking freeCodeCamp

They are unblocked but are still not operational. In the console when using freecodecamp.org I get errors reading:

"Failed to load ‘https://gateway.zscalertwo.net/au…’ with a bunch of parameters in the link saying that the response for preflight is invalid and so none of my students are able to complete the activities. So all http requests are still being blocked by zscaler even though students are authenticated with zscaler.

Do you have a complete list of sites that need to be whitelisted?