Another site is already using this domain (own domain, different team)

[perry]

sure!

see this guide:

[Support Guide] How to transfer a Netlify site to a new owner

Last reviewed September 2023. You’ve built an awesome website, but for some reason it’s on the wrong team. Maybe you accidentally put a work site on your personal account or maybe you are handing a site off to its new owner. It happens to all of us! There are two ways to accomplish the transfer. First and preferred, if you’re an owner of the site on any team, and an owner-level member of the team you’re transferring to, you can use the this flow. Self serve, immediate transfer, no downtime…

and if that doesn’t work, please visit Support, and choose dns/site transfer from the dropdown menu on the right, and we will assist you.