I'm new with Vercel and it seems like I'm the only one with this problem.
I imported a GitHub repository and created a project in Vercel. I have added a custom domain which is accepted by Vercel (I followed the given instructions and modified the DNS configuration)
When I access this custom domain, I have a 403 error.
The auto generated domains work, but not mine. I have no idea why.
double check that your domains were properly added to Vercel. You can check it in your settings under the domains tab - https://vercel.com/{username}/{project}/settings/domains. It should look something like this:
I would try removing the domain name then adding it back to Vercel.
Vercel will either tell you to add a type A record:
Type Name Value
A @ 76.76.21.21
Or a CNAME record if you are setting a subdomain:
Type Name Value
CNAME [subdomain] cname.vercel-dns.com
Vercel also has a page called "Why is my Vercel domain not verified? " which may help.
And finally you can point your name servers to Vercel which will allow you to set your domain name.
The only thing I was able to find on the Vercel documentation that mentions a 403 error is this page "I'm seeing 403 Forbidden responses."