Hello,
Are you using a Microsoft 365 account or a personal Outlook.com account?
Microsoft only supports automated webhooks for Microsoft 365. You can use the Microsoft Graph API to list bookings and create a subscription to receive POST notifications when new responses arrive. The data comes in JSON, and your site handles it. For setup, you need an Azure AD app with Bookings.Read.All permissions. Personal Outlook.com accounts do not support webhooks, so responses must be viewed manually.