The only thing I can tell you at this point is to request the IRS tax transcript by mail then, if you're sure you indeed filed both 2019 and 2020 income taxes (what you're describing does not sound like the annual income tax filing to me). Or go talk to a tax advisor as already advised above.I mean, I filled out an online form that calculates how much refund I get. then I filled out 1042-s, and sent it to appropriate institution, which I think IRS but I am not sure exactly where. just the regular process foreigners follow in the U.S. I had emailed IRS last summer and they told me I might not be able to track my filing online since I am a foreigner.