Where can I find detailed logs within Home Assistant and Google Cloud Project to effectively diagnose a "403 access_denied" error?

In Home Assistant, check 'Settings -> System -> Logs' or the `home-assistant.log` file in your configuration directory for specific error messages related to Google integration. For deeper insights, go to the Google Cloud Console, navigate to 'APIs & Services' -> 'Credentials', and under 'OAuth 2.0 Client IDs', look for usage metrics. More importantly, use 'Logs Explorer' (under 'Operations' -> 'Logging') to filter logs by your project ID and relevant API to see detailed error responses from Google's side, which often pinpoint the exact reason for the 'access_denied'.