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The CORS (Cross-Origin Resource Sharing) error that occurs when attempting to acquire an access_token from the oauth/token endpoint in Auth0 indicates that the request is being made from a different origin domain than the one registered in the Auth0 dashboard. This means that the browser is blocking the request due to security reasons, as it believes that the request may be a potential security risk. To fix this issue, the backend API application should properly handle the CORS headers to allow the request from the frontend application domain.