Was able to activate by changing resolution to 1400x1050 and typing code (but couldn't see it), Switched resolution to 1366x768 and then could see the code and activate. This software is really a mess. Now I can start the Business 2021 return but it will not let me save it! "File not found. Check the file name and try again". Looks like I will need to force the program to close and try again.
