I have a nextjs app deployed on Vercel on the domain foo.bar.com, and would like to deploy a second nextjs app on the subdomain foobar.foo.bar.com. Is there a way to achieve this?

When I try to add the domain foobar.foo.bar.com to the second app in Vercel I get the message
"Another Vercel account is using this domain. Please set the following TXT record on _vercel.bar.com to use foobar.foo.bar.com in this project."
Which makes me a little nervous that would lose the foo.bar.com domain from the original app if I continue, and we are in production with paying clients, so that would be a real issue.

Has anyone done something similar?