Currently when trying to update your dxdiag on the beta halowaypoint website it fails. I noticed my profile still had my build from 5 years ago on file and was trying to upload a new copy of my dxdiag system information, but it always gives errors out. If you go back to the regular website you can upload just fine though.
Hope this is the right place, wanted to maybe help bring this to the attention of the devs that this bug exists and help anyone else trying to update their system information for PC flighting.