Hi, @ownhome, and welcome to our Netlify community site.
I’m showing the DNS service for ownhome.io is at AWS Route 53, not Netlify. The branch subdomain feature is automatic only for Netlify DNS. There is more documentation about this here:
The solution for this is documented there.
Note, the record is currently this:
develop.ownhome.io. 60 IN CNAME develop.ownhome.netlify.com/.
However, it should be this:
develop.ownhome.io. 60 IN CNAME develop--ownhome.netlify.com.
(There should be no slash in the CNAME and the subdomain should be develop--ownhome not develop.ownhome.)
Please reply here when the required DNS record has been created and we’ll get the SSL certificate updated for this subdomain.
Also, because this DNS zone isn’t active with Netlify DNS, please delete the zone configuration at Netlify because having this configured while not active is known to cause other issues as well.
If there are any questions about this reply, we are happy to answer.