I-751: 30 Days and Still No Receipt Notice, Anyone Else?

Has anyone else not received their receipt notice yet? I’m at day 30 with no receipt notice, and I’m getting worried. If you did receive yours, what was your timeline?

I’m a pilot and I’m scheduled for training in January to fly a new airframe. I can’t attend the training without my receipt notice, and if I don’t get it within the next two weeks, I’m at risk of losing my job. Any advice?