WOW, this worked. I just got email reply from zenimax:Message Log:
The Elder Scrolls Online Team response on 03/05/2018 08:46 AM
Greetings!
Thank you for contacting The Elder Scrolls Online Team!
If you are receiving the message that you can only have one of a unique item when attempting to claim your level 18 reward, check if you have the "Room to Spare" Housing Brochure in your inventory. If you do, delete the brochure and attempt to redeem your rewards from the Level Up Advisor.
If you continue to have any issues, please let us know so that we may continue to assist.
Kind Regards,
The Elder Scrolls Online Team
This worked, thank you. Consider this thread closed.