Hi @matthewcornell,
Thanks for reaching out and welcome to the Support Forums!
I’m showing that your CNAME Record for docs.zoltardata.com is pointing to docs-zoltardata.netlify.com instead of docs-zoltardata.netlify.app (the difference is at the end for .com instead of .app). Could you try changing the CNAME Record to docs-zoltardata.netlify.app and see if that resolves the issue?
After changing the record and it propagates, click on the Renew certificate button on this page:
Let us know if you have any questions.