@Herrvader lol What!? Posting the topic WITH YOUR SCREENSHOTS below. Thank-you! 
@tomprodehl I forgot about this until @Herrvader reminded me… the most common issue for unlinking requests that fail is putting in the wrong information. So, the following information is selected content from the current User Solutions topic. Look at the screenshots and confirm you are entering the information correctly.
ISSUE: Device Limit Reached
This link is for Instructions and a link to the Request form to Unlink a Device :
How to Submit a Wallet Unlinking Request
Detailed Instructions with Screenshots below:
How to Remove Verified Devices (screenshots)
Additional Screenshots:
Form Screenshot (enlarged)
Rewards Internals Screenshot (enlarged)
Thanks to @Herrvader for the all screenshots!
Linked below is a screenshot of the email a user received from Brave Support. Is this the same letter you received?