Currently my friend is hosting a site from github pages using a custom domain, I want to change the hosting to my github pages for the same domain

[Rino-RKHTTP]

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I have the goDaddy credentials, Made changes in goDaddy added a C type record to my-username.gihub.io
The page is woking fine from https://my-username.gihub.io
but I am not able to add custom domain, getting a message Domain is already taken.
Why am i getting this error still after changing the godaddy records?
Should I ask my friend to delete the repo from his end?

[OshekharO]

Ask your friend to remove the domain association: If your friend no longer needs the custom domain or is willing to switch to a different domain, they can remove the domain association from their GitHub Pages repository. This will free up the domain for you to use.