We followed the support guide ([Support Guide] How to use Netlify’s branch deploy feature without Netlify DNS) to have our branch deployments for staging and prerelease environment under own own domain (without using netlify’s DNS)
We have the following entries on our DNS register:
prerelease.my-x.tignum.com CNAME to prerelease–my-x.netlify.app
develop.my-x.tignum.com CNAME to develop–my-x.netlify.app
Could you extend and refresh our SSL certificate to cover those subdomains?