Dns verification 2

Title: Let’s Encrypt certificate won’t provision — DNS verified but SSL fails (famous-melba-56bb65)

Site: famous-melba-56bb65 Domain: cornerstonesdevelopments.com

DNS verification just passed successfully, but immediately after clicking “Provision certificate” I get: “We could not provision a Let’s Encrypt certificate for your custom domain.”

A record for @ is 75.2.60.5, fully propagated globally (confirmed on dnschecker.org). www subdomain is verified. I believe there is an orphaned NS1 zone for cornerstonesdevelopments.com blocking Let’s Encrypt validation. Please can you clear it?