Has you a speical Character or a Umlaut in Ihr Passwort? If yes change it to password with only letters and numbers.
Eliminating special character from my password did not help.
My password consists of 9 characters, two capitalized and two numbers.
You can login in Adobe Site?
I solved the problem.
I was logging into my library's OverDrive account with my library card number.
I created an OverDrive account, into which I loggin with my email address.
Then I specify my library and find an ebook in the library.
When I borrow the ebook, I have to supply my library card number and password.
From checkouts, I download the ebook , epub option, to Adobe Digital Editions on my Windows 10 computer..
Now, when I enter Adobe Digital Editions, I can authorize with my Adobe id because my OverDrive account was logged in with my email address instead of with my library card number.