Cannot sign-in to Creative Cloud

I just purchased Creative Cloud Photography plan  and installed it.

but I am unable to activate it.
When I launch Creative Cloud it says I have to sign-in, but then it gets stuck forever,

and does not show the sign-in form to fill in the Id and Password.
To fix the problem I tried the following:
- I uninstalled and re-installed  Creative Cloud

- I deleted the contents of: "C:\Users\Lizzy\AppData\Local\Adobe\OOBE"

- I restated my computer

but nothing helps.

How can I fix this problem and start working with LightRoom regularly?

Thanks, Lizzy