This action is a delegated Graph API gateway, scoped exclusively to your own Outlook mailbox via the endpoint:
https://graph.microsoft.com/v1.0/me/
You’re invoking real-time HTTP requests to the Microsoft Graph API — just like a backend developer — but from inside your cloud flow, authenticated under your own Office 365 login.
Please refer to the full article using the Mastering “Send an HTTP Request” in Outlook 365 Connector | LinkedIn