I just added the custom domain. I transferred the NS from Amazon Route 53. I only have the default DNS records in Vercel. Should I wait a little longer for the update to propogate?
The domain troubleshooting guide can help with most custom domain configuration issues. You might be able to use that guide to solve it before a human is available to help you. Then you can come back here and share the answer for bonus points.
You can also use v0 to narrow down the possibilities.