DNS Problem specific domains

Do you have any private hosted zone in route53 using the same domain name?

If there's a matching private hosted zone but there's no record that matches the domain name and type in the request, Resolver doesn't forward the request to a public DNS resolver. Instead, it returns NXDOMAIN (non-existent domain) to the client.

See https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/hosted-zone-private-considerations.html#hosted-zone-private-considerations-public-private-overlapping