Same situation as you, just received AOR and in the online account it says: "We need additional documents to process your application. We will send you a letter or email with details." but no idea which ones. I saw that you applied single, but they asked for common law proof. Is it because you became commons laws after you sent your application as single? If so, I am on the same boat too haha.
Hope the best for you and your family, and "Mucha fuerza y un abrazo desde el otro lado del Río (Uruguay)"