Based on what the users said, it appears that the Nook Study required both a Barnes and Noble account and an Adobe account as well. It was best if the accounts from these services used the same email address because compatibility would have been very high. With the new version of Nook Study, Adobe ID requirement was removed.
Here is the page where users talked about this: https://bookclubs.barnesandnoble.com/thread/28912
You can use it as a reference related to your question and how to proceed further.