[solved]
had some luck to get a chat with an adobe-supporter.
For everyone who has the same problem:
The solution is easy.
Open the programm
Press CRTL SHIFT and D and erase ID (also, if you don't have an ID on the pc, like in my case)
Restart the programm
try again to authorize with your id
-> works on my pc, hope, it workes for you, too.