I am absolutely new to GitHub so this may come out as a silly question. I am trying to host my website using GitHub pages. The website got hosted properly, but when I added the custom domain, it stopped working and now I am getting a blank page. What I have done is, have created a subdomain in my AWS-hosted zones (subdomain.example.com) and pointed it to https://my_org.github.io/my_repo/
Then I added subdomain.example.com in github page custom domain and CNAME file in the repository.
The error I am getting is
DNS check unsuccessful subdomain.example.com is improperly configured Domain's DNS record could not be retrieved. For more information, see documentation (InvalidDNSError).
I am not sure what I am missing exactly. Does anyone have any idea about this?