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.

https://vercel.com/docs/projects/domains/troubleshooting

You can also use v0 to narrow down the possibilities.

Does no one know how to answer this question?

Thank you for reaching out to Vercel Support! We are happy to help out with your domain. It is possible use Cloudflare as a proxy in front of Vercel by setting the SSl encryption mode to Full on Cloudflare. For more on this setup we do have a guide and troubleshooting steps here: https://vercel.com/docs/integrations/external-platforms/cloudflare#using-cloudflare-as-a-reverse-proxy

If you are also using Cloudflare Access as the protection layer for the site. It will redirect all requests to Access. In such case, you need configured a bypass rule in Access that will allow the requests to the /.well-known/acme-challenge/* to pass through.

https://vercel.com/docs/integrations/external-platforms/cloudflare#troubleshooting

Okay, so I need to access Access in Cloudflare, then to Zero Trust, and there in which section do I define the rule that allows traffic through /.well-known/acme-challenge/*? Thank you so much sir

Hi, You can find more details here https://developers.cloudflare.com/cloudflare-one/policies/access/app-paths/ or contact Cloudflare support. Thanks!