Domain name not resolving

I have purchased a domain name from route53. I have successfully registered this domain name and created a hosted zone.

When the domain was purchased through Route 53 a public hosted zone would have been created with the correct NS records in place. There shouldn't have been a need to create a new hosted zone as a separate step.

But you are where you are now, what's important is that all four name server records in the registered domain https://console.aws.amazon.com/route53/domains/home#/

Need to match the name server records in the hosted zone https://console.aws.amazon.com/route53/v2/hostedzones#

It would be best not to touch the records in the Registered Domain section and instead alter the Hosted Zone records to match. The steps to do this are here (I know you're not really migrating the domain, but the process is the same) https://repost.aws/knowledge-center/route-53-update-name-servers-registrar

Steps 4 thru 9 of this document go through the same steps in more detail https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/migrate-dns-domain-in-use.html

It sounds like you may have tried this already, but did you lower the TTL (time-to-live) value before starting? This is usually set to something like two days, reducing it to a shorter value like five minutes will mean the updated values will propagate quicker. You can always increase it back to the original value when you are confident everything is working.

Also, if you are using DNSSEC then probably best to stop using it until you get the basics straightened out, then you can re-introduce it.

Ensure you provided a valid email address at the time of registering the domain. You need to verify your identity before the domain is resolveable on internent. If you do a nslookup and see a NXDOMAIN for a new registed domain most likely you have not been verified yet or the verificication is failed and your domain was suspended. This is a requirement for regulatory purposes. Do not make any changes to the Name Servers in your public hosted zone. Check point number 9 on this document. https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/domain-register.html#domain-register-procedure-section

Ensure that the NS (Name Server) records for your domain in Route 53 are correctly pointing to the AWS-provided name servers. You mentioned that you switched the name servers based on information from ICANN lookup, so make sure you have the correct name servers set up in your Route 53 hosted zone. It can take some time (usually up to 48 hours) for DNS changes to propagate globally, so if you recently updated the NS records, you might need to wait for propagation to complete before the changes take effect If the SSL certificate is still pending validation for an extended period, double-check that the validation records (CNAMEs) are correctly configured and that the certificate authority can reach them for validation. Keep in mind that DNS changes and SSL certificate validations can experience propagation delays, so it's possible that the changes you've made are still in progress. ,also it may be helpful to review AWS documentation https://docs.aws.amazon.com/amplify/latest/userguide/custom-domain-troubleshoot-guide.html or reach out to AWS support for further assistance, as they can provide specific guidance tailored to your setup and configuration.