This just means you’ll need to do a Wallet unlinking request form as is discussed at Unable to re-verify wallet - #118 by Mattches
Just a FYI, this is actually something they are modifying/eliminating in the next month or two. I think they said the next build that gets released (if things don’t delay it) is going to have the option for users to unlink their own wallets.
But I’m guessing you had it on other devices or something? It shouldn’t be showing that unless you’ve connected to it with different internal wallets. So like reinstalling Brave, using Brave on multiple devices, etc all can do it. If you sincerely never have, then it’s weird to be happening.