So just to be clear, you got this same domain on Cloudflare Registrar with the same account that you're trying to use Pages with custom domains with, right?
@Fernando Dilland Sorry for the delay, I just started looking into this issue internally. Would you be able to send over a HAR file capturing the custom domain setup flow, including entering the problematic domain and clicking "Continue"? You can sanitize it with this: https://har-sanitizer.pages.dev/
At Cloudflare, we're committed to building a better Internet. We want to make it possible to troubleshoot with HAR files without the threat of a stolen session. The HAR File Sanitizer will remove sensitive data using “clientside” logic.
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