Sorry I've been working or I would have responded quicker.. I submitted last 3 years(2019, 2020, 2021) tax transcripts for myself and my joint sponsor, 4 months pay stubs, w2s, letter of authorization from employer.. the one thing I'm sure I missed was proof of citizenship for my joint sponsor.. I'm sure that I sent everything needed to show proof of income.. that's why the letter confuses me.. I am seeing that he didn't qualify because his income isn't enough(he made just over the amount needed).. but then they are asking for proof of his citizenship.. I plan on making an appointment with the office, I'd like to be as prepared as I can be when I go there