We just pushed an in-product alert too... "We are currently in the process of manually receiving delayed acknowledgments from FINCEN but have seen an increase in Error A2: The element is recorded for an inappropriate party type. For steps to resolve..." that calls out the article and steps above for just checking those lines. it's kind of a two fold issue... First there are significant delays in acks and then secondly the reject error. I will try to keep you guys in the loop with any new information as we have it. 
