I had the same problem. What worked for me is disabling Brave shields for the page that has the confirmation button. To disable shields, click on the icon next to the brave address bar that looks like a lion’s head. That will open a dropdown that has some sliders. Click the top most slider, and that will disable all shields for that page. After that, reload the page, and then click the confirmation button again. I’m going by memory here, so this may not be 100% correct, but it should be enough to get your wallet verified.
Edit:
Ok, I was able to disconnect my wallet and recreate the process. See the screenshots below:
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Click on the uphold wallet button on brave://rewards page:
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Click on the button to connect to the Uphold wallet, and it should take you to the following page.
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Click on the lion’s head icon next to the address bar.
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Click on the top slider to disable shields for that page.
After that, it automatically refreshed the page. Just click on authorize and follow the prompts. Hopefully this is helpful.