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Error Adding Custom Domain: "Another site is already using this domain"

I am trying to add a custom domain of mubc.io to the website currently at the following URL: https://miamiblockchainclub.netlify.app/. I get an error with the following message: “Another site is already using this domain”. I don’t know what site or account is using it. Our club owns this domain through AWS Route 53, and there isn’t a site deployed to it.

Hey there, @ryanschuerkamp :wave:

Welcome to the Netlify Forums! We are glad you found us :slight_smile:

This error message is happening because the custom domain you’re trying to use already exists on Netlify under a different account.

If you’re not sure who is using it, please verify domain ownership and let us know by responding here when that’s done. If the verification is successful we can remove the domain from the other account so you can use it on yours.

Never mind. I deployed using GitHub pages