I purchased two domains from vercel but it shows it's from a third party

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Continuing the discussion from Cannot validate domain - AAAA record deleted but failing:

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The domain troubleshooting guide can help with most custom domain configuration issues. You might be able to use that guide to solve it before a human is available to help you. Then you can come back here and share the answer for bonus points.

You can also use v0 to narrow down the possibilities.