Just to update, it activated. I am not sure if this helped:

1) Check devices for your Win 10 account. My PC was checked off. Restart, a few times (think I did 4-5 restarts). Continue checking your devices.

2) Eventually the screen stopped giving a blank page. Asked to enter MS account email and password. Activated.

No idea if checking your devices within an internet browser in step 1 (don't recall where I even went to get that option) helped, but all seems to be working now.