Why? Not authorized! The authorization failed with the following error message: Request failed.. Please close this window and return to Cesium for Unreal

Hi

Sorry to hear you’re having trouble! It looks like this may be an issue with your firewall settings blocking the HTTP POST request. In this forum thread, a user was having a similar issue and was able to fix it by adding system environment variables for HTTP_PROXY and HTTPS_PROXY. Can you try that out and let me know if it works?