I concur with miklk99. I have spent hours reading the various TT posts on solving the activation screen issue via resolution, scaling, and network changes. For my 9-month-old Lenovo computer, none of these worked. When I used the Lenovo system update tool, it said all of my drivers were up to date. I assumed that was true, but when I went to the intel site below and downloaded their system analysis tool, it found several newer drivers, included a video driver from just 4 weeks ago. Installing that newer driver, which was recommended but not required, solved the blank activation screen. I happened to be in 800x600 mode when I launched TT so I don't know if it now works on my default 1920x1080 laptop resolution.
Thanks for the inspiration to query Intel directly rather than my laptop manufacturer.
https://www.intel.com/content/www/us/en/support/intel-driver-support-assistant.html
