Can’t manually approve a domain transfer out of Vercel.
We normally have the option to approve a transfer out with other domain registrars instead of waiting the 5 day period.
Domain is stadiumguessr.app
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.