SSL provisioning blocked — "certificate parameter is required when updating an existing certificate"

▎ Site: calum-portfolio-app.netlify.app
▎ Custom domain: calum-smith.com (+ www.calum-smith.com)
▎ DNS: Netlify DNS (dns1–4.p05.nsone.net), verifies successfully

▎ “Verify DNS configuration” passes, but “Provision certificate” fails with certificate parameter is required when updating an existing certificate. Removing and re-adding the domain does not clear it. Both apex and www currently serve the shared *.netlify.app DigiCert wildcard, so browsers show ERR_CERT_COMMON_NAME_INVALID.

▎ Please reset the stale SSL/certificate record on this site so a fresh Let’s Encrypt certificate can be provisioned. I have never uploaded a custom certificate.