@SamO Threads concerning this particular domain are suspect.
They’re frequently attributed to different names/usernames.
They tend to just repeat the message found in the original post.
@ezzineelrhami Netlify won’t just remove the domain from other accounts because you’ve asked.
You must prove ownership by follow the instructions in this Support Guide:
https://answers.netlify.com/t/support-guide-verifying-domain-ownership-for-netlify-custom-domain/13765
Add the TXT record to your domain.
The name should be verified-for-netlify
The value should be:
https://answers.netlify.com/t/please-help-us-help-you-by-writing-a-good-post-dns-message/127506