Thank you @Critter! Your tip solved my problem (13 April 2022) when Intuit proved to be a black hole regarding customer support. In my case, I had ALREADY ACTIVATED my copy of TurboTax but had interrupted my initial "interview" when the TurboTax script asked me to provide W-2 information because my employer has not bothered to provide the information online (despite over 1,000 employees) and I did not have a physical copy of the form in my possession. When I tried to resume with my W-2 form in hand, TurboTax choked immediately after performing an update (which it had already done before) and asked for my activation code. After I provided the activation code (which I had already used to start my return a few days earlier), the TurboTax script rejected the code as invalid. After reading your tip, I ran Windows Update (which supposed ran automatically yesterday) and rebooted which solved my problem.
