After countless frustrating attempts at browser cache settings/popups/etc, I got mine to import using the screen display settings work-around. It seems that in Windows 10 there's a display glitch where certain windows pop up but dont' display properly.
So, what tech support told me once on initial install (this is for desktop version by the way), if you get a pop up asking for login info or license nmbr and it doesn't appear to have the fields to enter, you need to access your display settings (start>settings>display), then change either size or resolution setting and save, then alt-tab back to TT and you should see what you couldn't see before. The BIG PAIN IN THE A** is that you may have to alt-tab back and forth several times to complete your login for itsdeductible, but it may work if this is your issue.
Technical issue glitch they need to fix
(I am working in TT HAB2020, by the way)
