The NFL Background Check site appears to still be active. If you have not signed up yet, please do so as soon as you possibly can.
Remember: You cannot work any NFL events, all over both cities, without going through the background check.
This link will take you to the Background Check Instructions, and after you have read the instructions, you should take your credentials photo.
Then, at the very end of the instructions, there is a link to start the actual background check.
(You can submit the background check without a photo for now, if you are not able to take one first.
Send the photo, when you are able, to info@IATSE13.ORG.)