Figured out the issue. Thanks to AI for catching such horrible issues in turbotax.
File was not password protected.
File was created by mac turbotax2024 software last year.
Issue: My .tax2024 was old as it was last generated in March/April. The same file was not usable now.
Resolution: It needs to be reloaded in turbotax2024 software again, so the freking software can update and write the latest version again to be compatible with 2025 online application. This new file I was able to upload on 2025 Turbotax online.
BTW. turbotax 2025 software was able to read old .tax2024 file successfully. I was trying to port desktop progress to online, but there is not such option it seems. You can only port 2025/current application from online to desktop.
