@pk @tagteam
Thanks for sharing the suggestion from @tagteam. I tried it but did not find any temp backup files being created on my desktop. With TurboTax open, I searched my computer for tilde files as well as those with suffix .tax2021 but came up empty for temp files. I'm using a Mac desktop and wondering if that makes a difference in whether and how temp backup files are created and stored.
One thing I noticed that may or may not be relevant concerns file size: the .tax2021 file that was saved upon successful completion of e-filing my return is 3.1 mB. When I re-open this file using TT, which leads to the (incorrect) message that I have not e-filed a return, TT then saves the .tax2021 file as 2.7 mB, smaller than the original. Makes me wonder if the original file contains information that I e-filed, but this somehow got corrupted so that when re-opened, TT cannot read this and saves a smaller file omitting this.
Having noted this, every time I've tried one of these suggestions, I have used the original tax file that was saved when I e-filed. I go into my Mac's TimeMachine backup to retrieve this file. I also tried retrieving the version of TT that I used to e-file, in case any of the subsequent updates made it incompatible with reading my e-file history, but this didn't make any difference. After running into all these dead ends, it seems like I'll need to paper file the amended return once my e-filed return is processed.
