For the LTI Consumer, make sure to set "Request users' username" and "Request user's email" totrue. You may need to reach out to someone at EdX to enable this for your course.
Using a superuser account, login to your site's Django Administration area. This can be reached by adding /admin to the end of your Studio URL.
Locate the Xblock_config section, and click Course edit lti fields enabled flags.
If the course you wish to enable these fields for is missing from the list, click the Add course edit lti fields enable flag button to add your course.