Which specific Google APIs must be enabled in the Google Cloud Project to prevent "403 access_denied" when integrating Google Assistant with Home Assistant?

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Grade: Education Subject: Support
Which specific Google APIs must be enabled in the Google Cloud Project to prevent "403 access_denied" when integrating Google Assistant with Home Assistant?
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For Google Assistant integration, the most critical APIs to enable are the 'Google Assistant API' and sometimes the 'Cloud IoT API' (depending on the integration method or devices). Other Google integrations (e.g., Google Calendar, Google Cast) will require their respective APIs, such as 'Google Calendar API' or 'Google Cast API', to be enabled within the same Google Cloud Project.