I had a personal and a business that I opened in early January. Once the points and $100 credit posted, I cancelled both of them (personal last week and business yesterday).
I submitted 2 applications for the personal card today and both went to review. I called the credit analyst line (888-503-6092) and they asked if they were duplicates. The rep also saw the 3rd app that I had in January. I responded they were not duplicates, and after a brief hold, was approved for 2 cards at 10K limit each.
Hope that helps