Hi,
Welcome to our forum.
>> I want to add a single attendee to the event based on the request.
You can achieve this purpose in Outlook client by right-clicking the event then choose Invite Attendees.
And here we mainly focus on general issues about Outlook desktop client. If you’d like to solve this issue by using Microsoft Graph, it is suggested to post a new thread to the MSDN forum for Outlook for more dedicated response.
https://social.msdn.microsoft.com/Forums/en-US/home?forum=outlookdev
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thanks for your understanding
and hope your question will be resolved soon.
Regards,
Aidan Wang
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