I’m using Netlify DNS for my site wags.fm and I’d like to point yap.wags.fm to a site on AWS App Runner. I created a CNAME using the config below, but when I navigate to yap.wags.fm, it times out. The site to which it is pointing, however, is fine.
Not using App Runner, I cannot provide specific advice. The AWS App Runner Developer Guide under the Managing custom domain names for an App Runner service provides all the information relevant to configuring a custom domain.
A couple of things that stand out after reading it
Certificate validation record is required/provided which is not present in the screenshot provided.
Until DNS validation occurs, the app is not available using the custom domain.