Actually we don't know why some of the EAD are being delayed. So far, people who got their biometric on July 29,30,31 are not getting any status change, but most of the people who had on August 5,6,7 got their status changed. I don't think it's because of a12, or c19. I had biometric on July 29th and put a12, but nothing so far.

@KhateBuda did they say anything about your status?