Worked on the home-assistant/core repository to enhance the OAuth2 authentication flow for the August integration by refactoring error handling and introducing targeted exceptions for token requests. This update improved the reliability and clarity of authentication failure states, making it easier to diagnose and address issues during the OAuth2 process. The approach focused on backend development using Python, with an emphasis on robust API integration and comprehensive error handling. Unit testing was employed to ensure the new exception paths functioned as intended. The work resulted in a more resilient authentication experience, reducing ambiguity and improving maintainability for future development and debugging efforts.