Cannot provision Let's Encrypt certificate — DNS verified, Let's Debug shows All OK

Support
1

Hi Netlify support,

I’m unable to provision a Let’s Encrypt certificate for my custom domain.

Site name: flourishing-faloodeh-97bc45.netlify.app
Custom domain: 3dmillion.co.kr (primary)
Alias: www.3dmillion.co.kr
DNS provider: External DNS (Cafe24, Korean registrar)

DNS configuration:

  • A record: 3dmillion.co.kr → 75.2.60.5
  • CNAME: www.3dmillion.co.kr → flourishing-faloodeh-97bc45.netlify.app

What I’ve verified:

  • All domains show green in Domain management
  • “Verify DNS configuration” succeeds every time (“DNS verification was successful”)
  • Clicking “Provision certificate” immediately fails with “We could not provision a Let’s Encrypt certificate for your custom domain.”
  • Let’s Debug (http-01) returns “All OK!” - no issues found
  • No CAA records on the domain
  • DNS has been correctly configured for over 24 hours
  • The site loads fine over http://3dmillion.co.kr

Note: my DNS provider automatically creates a wildcard CNAME record
(*.3dmillion.co.kr → 3dmillion.co.kr) that I cannot delete from their panel.
Please let me know if this could be causing the issue.

Could you please manually provision the certificate, or advise what else I should check?

Thank you.