Getting error message when addin our subdomain to a landing site we created

PLEASE help us !

  • our jsut created funnel site: 10-marketing-questions.netlify.app
  • trying to add custom domain: marketing.wearews.com
  • getting error message stating that the submitted subdomain is already managed by Netlify DNS
  • asked chatbot but unable to get resolution

I’ve routed this to our helpdesk, we’ll follow up via email.