Sign-In Troubles

Hi,

I had purchased an ebook textbook for school purposes, while on a public library computer. The day of purchasing i was able to access my ebook. When returning to the public library another day, I was unable to sign in to Adobe that was associated with my ebook, as it says it is not the authorized Vendor ID. I had tred all possible log ins that I would have used and none of which have allowed me to access my ebook. Looking for assistance to access my ebook as it is needed for my current school courses. Wondering if maybe being on a public library would impact why i cannot access my ebook. Thank you.