Photoshop CC 2020 closes seconds after starting
Hello community,
my Photoshop (current Version 21.0.1) is closing automatically after launching. It takes a few seconds for the program to check that it is not logged in and closes without any further information.
My Creative Cloud application is logged in and I can manage anything:

When I open Photoshop nothing happens and I can see that it is not signed in:

When I click on "Sign In" a new Adobe windows opens but nothing happens (kind of a loop):

Afterwards the Photoshop application closes automatically and I cannot do anything. It also closes if I skip the step with Sign In and wait for a few seconds.
The strange thing is: Photoshop worked with the older version 20.0.1 until last monday. Photoshop first checked the Sign In status (this took up to a minute) and launched the application afterwards. Then I accidentally updated to version 21.0.1, and now I cannot go back because version 20.0.1 is no longer available. Now I cannot use Photoshop any longer. Adobe support was not able to help.
Information: this is my work PC and I cannot change the Windows user account. But I have administrator access.
I hope that someone is able to help.
Cheers!
