I’ve recently added the vercel name servers to my domain with hostinger, mrsuds.com.au. There are no DNSSEC settings on Hostinger, as there are no DNS entries except for the name servers.
I’m receiving the “Disable DNSSEC” error on Vercel. I believe there are residual entries that need to be removed manually, as per other threads I’ve seen on this forum.
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.
If you share the domain here, that would let the rest of us help you debug.
The troubleshooting tips linked above also have some resources that can help you. And Hostinger support may be able to help more if you need help managing domain settings on your account there.