Hi there and welcome
Can you disconnect the Nook
On the Dell, in Adobe, go to Help > Authorization Information.
The authorization window will open and show you what credentials you're currently using for your computer.
Close ADE and wait a few moments.
Connect your NOOK to your computer.
Open your Windows Explorer (or File Explorer) and double-click your NOOK under "[My] Computer" (or "This PC").
Find the .adobe-digital-editions folder and delete it.
Open ADE, then try transferring the eBook again.
After the transfer, disconnect your NOOK. You should now be able to read the eBook on your device.
Let me know please how you go