URGENT: Authorization issue/ebook download not connected to my account

I bought an activation code at my school's bookstore for an ebook, downloaded it, and then used it for a week before it started malfunctioning. It starting saying activation error. So I asked my IT what I should do and they said to de-active and reactivate using my adobe id. However, when i downloaded the ebook i never even made an id I jsut downloaded through my school's bookstore/activation code. So i honestly don't know how to get back into the ebook if I never downloaded it connected to an ID in the first place. So I made an ID but obviously because I didn't download the ebook through the id my username/pass won't work to authorize it. I honestly don't know what to do and I've asked many people to assist.