What does it mean when the message says "fatal: unable to access" due to not being granted write access to the repository remotely?

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This message means that the user does not have permission to write to the repository. This could be due to several reasons such as the user is not listed as a collaborator or contributor, the user does not have the necessary permissions set up, or the repository owner has restricted write access to certain users or groups. To resolve this issue, the user should verify their access permissions with the repository owner and ensure that they are granted the necessary write access to the repository.