Domain already managed by Netlify DNS on deleted team

Hi, I’m trying to add my custom domain mangolingo.online to my current
Netlify site, but I get this error:

“mangolingo.online or one of its subdomains is already managed by
Netlify DNS on another team.”

I previously had this domain connected to Netlify DNS under a team
that I’ve since deleted. The domain’s nameservers are now pointed to
Spaceship (launch1.spaceship.net / launch2.spaceship.net), and I’ve
manually added CNAME records pointing to my Netlify site
(stunning-dusk-f8101e.netlify.app), which shows as “ONLINE” in
propagation status. However, the domain still returns “Page not found”
because Netlify hasn’t recognized it as a custom domain on my current
site.

Could you please release the old DNS zone for mangolingo.online so I
can add it properly to my current project?

Thank you!