How to add new participants to an already created Online Meeting using Graph API?

Hi LeeJinWoo,

adding new participants to an already created online meeting using the Microsoft Graph API is possible, but there are some limitations and considerations to keep in mind:

1. Notification for Adding a Meeting:
Currently, the Microsoft Graph API does not provide a built-in way to notify users when they are added to an online meeting. You might need to implement a custom notification system in your application to inform the users that they have been added to a meeting.

2. Sharing Chat History: As per the current functionality, the chat history is not shared with the users who are added to the meeting after the chat has started¹². The new participants only see chats from the time they joined. This is a limitation of the current API and there is no workaround available at this time.

Here are some useful links as a reference
Microsoft Graph API to add online meeting participants. https://techcommunity.microsoft.com/t5/teams-developer/microsoft-graph-api-to-add-online-meeting-participants/td-p/1571998.

microsoft graph api - Send notification email to attendees when https://stackoverflow.com/questions/58448837/send-notification-email-to-attendees-when-creating-new-event-to-o365-calendar.

MS Teams - Allow attendees report using Graph API for the online meetings. https://stackoverflow.com/questions/75247939/ms-teams-allow-attendees-report-using-graph-api-for-the-online-meetings.

Is it possible to share chat history to onlinemeeting new participants https://techcommunity.microsoft.com/t5/teams-developer/is-it-possible-to-share-chat-history-to-onlinemeeting-new/td-p/3851725.

Choose an API in Microsoft Graph to create and join online meetings.
https://learn.microsoft.com/en-us/graph/choose-online-meeting-api.

Is it possible to share chat history to onlinemeeting new participants  
https://techcommunity.microsoft.com/t5/teams-developer/is-it-possible-to-share-chat-history-to-onlinemeeting-new/td-p/3851725.

Microsoft Graph API assign participant role to online meeting. https://stackoverflow.com/questions/65896826/microsoft-graph-api-assign-participant-role-to-online-meeting.

Create Microsoft Teams Meeting invite programatically using graph api
https://stackoverflow.com/questions/67504165/create-microsoft-teams-meeting-invite-programatically-using-graph-api.

https://learn.microsoft.com/en-us/graph/api/resources/meetingparticipants?view=graph-rest-1.0