That this problem remains a year later is absolutely absurd!
I too was getting the empty activation window with the 2021 version I downloaded today, a Black Friday deal. It took a bunch of googling to find this thread, and a fair amount of additional messing around to get it to work.
My PC is very new, a laptop recently upgraded to Windows 11. I run dual monitors. The laptop's native resolution is 2560x1600. My main display is a wide monitor, 2560x1080. I moved the frozen window to the laptop screen and changed that to 800x600. The blankness was replaced with a place to type the code and some buttons, but it was not possible to type in the box provided. I tried other resolutions, including 1024x768. Eventually the box appeared WITH THE CODE FILLED IN. Apparently one of my earlier attempts at pasting it worked, but it couldn't show me that it worked any more than it showed me that I could type in the box. In any event I did succeed in registering.
Someone should be fired over this, and I am not exaggerating. Probably more than one. Possibly much more than one. Intuit had MORE THAN A YEAR to get this problem SOLVED. Instead a NEW RELEASE of an annual product REPEATS the failures of the one from a year earlier. Somehow, somewhere, in what I am sure is a labyrinth of management and confused responsibilities, this was ignored. Even if the problem was supposed to be handled by some peon programmer, the responsibility lies in management. The team responsible for the install did not do their job. The testing group didn't do their job. The management of Turbo Tax development did not do their job, which is to make sure the work gets done correctly.
