I agree with Mrs. M, I think they are very particular. In hindsight, I think if you request to have them freeze no matter what grade, I think they would do it. Never got a real clear answer about that. I had four embies on day 5 that were very good quality and I ended up with one to freeze. Now, since I did have success, I'm glad that I have just one, but still I do question their decision on freezing. They do use vitrification so it does not make sense.
Hoping that you have success soon.