I recently tried to achieve authorisation for my computer in Digital Editions. To do this I had to put in my Login and Password which I did but was rejected on the grounds that it had to be the same as that in use on another device. Unfortunately for me that was the ID and Password I had used. I tried again and again, same result unsurprisingly. Then I tried changing my password - twice - same result. Password works Ok because I can get into this forum but I cannot authorise my other computer for Digital Editions using this account.
Try to reselt the password and used only Letters an Number. With all other has Digital Editoin sometimes problems.