We changed our file transfer method to Media File Transfer Protocol, which is not recognized by desktop ADE yet.
To activate books on NOOK HD devices:
1. Transfer ADE books from desktop (User/Documents/Digital Editions folder) to device using our file transfer (drag & drop)
2. They will appear in Library -> My Files
3. Connect to Wi-Fi with good-to-excellent signal strength
4. Tap on the book to open
5. Input their ADE account credentials into the credential form (username in the first field and password in the second)
6. Press OK
All the subsequent books from the same ADE account will open after this. You will no longer need to perform all the steps or have Wi-Fi; just transfer books to device and tap on them.
OR
1. Connect to Wi-Fi with good-to-excellent signal strength
2. Go to Settings ->Account Settings -> Adobe Digital Editions
3. Tap on Add User
4. Input your ADE account credentials into the credential form (username in the first field and password in the second)
5. Press OK
6. Transfer ADE books from desktop (User/Documents/Digital Editions folder) to device using our file transfer (drag & drop)
7. They will appear in Library -> My Files
Tap on any file to open it.