Has you Digital Edition and you reader authorize with the same Adobe ID?
My Kobo is authorized. i don't know if my computer is authorized. if it's not how do i authorize my computer? I did buy a new computer so maybe it's not.
Start Digital Edition.
Press ctrl + shift + d.
Accept that remove the authorize when get the prompt. (If not skip the point)
Go to help > Computer authorize. Enter your Adobe ID data.