Hi,
Based on my knowledge, you need to use the EWS API to set the "Deliver meeting requests to my delegate" option. You can use the Set-MailboxDelegate cmdlet to do it.
For more information about it, actually we have a dedicated support team regarding the Microsoft Exchange development. I recommend you ask your question on our Microsoft Exchange development forum which is staffed by more experts specializing in this kind of problems. Thanks for your understanding.
For your convenience:
https://social.technet.microsoft.com/Forums/exchange/en-US/home?forum=exchangesvrdevelopment
Hope this can be helpful to you.
Best regards,
Hi,
Any update?
Best regards,