How to disable or customise the emails that outlook send to attendees when we create an event using outlook calendar api ?

This is a known limitation of the Outlook Calendar / Microsoft Graph API. When you create an event using the Create Event API (POST /users/{id}/events or POST /me/events), Outlook automatically triggers its built-in invitation email workflow. As of now:

You cannot customize the email template that Outlook sends.

You cannot send different emails to different attendees.

There is no official flag or parameter that disables Outlook from sending invitations.

What actually needed

A realistic solution would require one of the following features from Microsoft:

A boolean flag (e.g., sendNotifications: false) This would allow creating events silently—without Outlook sending any invitation emails—so developers can send their own fully customized emails.

1. Custom email templates or override functionality Allowing apps to customize the invitation email content, branding, or format before it's sent.This is a known limitation of the Outlook Calendar / Microsoft Graph API. When you create an event using the Create Event API (POST /users/{id}/events or POST /me/events), Outlook automatically triggers its built-in invitation email workflow. As of now:
   • You cannot customize the email template that Outlook sends.
   • You cannot send different emails to different attendees.
   • There is no official flag or parameter that disables Outlook from sending invitations.