I ended up printing a duplicate of my 2019 and sending it with a letter explaining and including the DCN provided by TT (that's the tracking number provided by the IRS to TT when taxes are e-filed) - I wrote COPY on the top of every page - I've heard rumors that sending tax forms in twice can cause problems - but that's the real problem, there's no good information on this - I'm working of of rumors, various posts from individuals and what TT recommended. At the same time, in a separate envelope, I sent my 2020 on paper (e-file wouldn't work because 2019 hadn't been processed yet). I sent both by certified mail and then I crossed my fingers.
Have not yet received 2019 tax return, second stimulus (filed for tax credit in lieu) and who know what will happen with my 2020 tax return. At the going rate I expect it to take well into 2022.
