Domain iszi.fr blocked - "Another project already uses this domain" (Bolt deployment)

Hi Netlify Support team,

I’m unable to add my custom domain iszi.fr to my project.

My Netlify project: iszi (URL: iszi.netlify.app)

Team: MABEAUTYPLUS D (slug: jobo92800)

Custom domain I want to attach: iszi.fr

Error message: “Another project already uses this domain.”

Context / what happened:

I originally built my website using Bolt.new, which deployed it to Netlify automatically. At that time the domain iszi.fr was attached to that Bolt-managed project. The Bolt project is not in my Netlify team, so I cannot remove the domain from it myself.

I have since rebuilt my project on my own Netlify account (project name: “iszi”), and I now want to attach iszi.fr to this new project. But Netlify blocks me with the error above.

I am the legitimate owner of the domain iszi.fr (registered at OVH). I can prove ownership via a DNS TXT record if needed.

Could you please release the domain iszi.fr from the previous (Bolt) project so I can attach it to my project “iszi”?

Thanks a lot for your help!