Hi there. It will be accepted...just takes a bit of time. If it gets kicked out and rejected, you'll receive a notice through the filing system you used. (I think all will, but I only know the systems I use)
We had one rejected because I had the wrong AGI from previous year. Easy enough fix, but it was longer to accept after the initial file.
I'm pretty sure, it's that the system can only handle so many at a time. There were quite a few people lined up at the H&RBlock and JacksonHewitt kiosks around here--can't imagine what the actual offices look like.
Hang in there...it's the best we can do while we wait.