Email notifications not being sent while creating events via Microsoft Graph API

Question

As part of creating events on user(organizer and attendee) calendars, we, here at Yello are making use of the Microsoft Graph API's event endpoints. The events are getting created/updated properly but no notification emails are being sent to the participants. While sending the same request via Graph explorer, we were receiving notifications and the event as expected. Is there a setting on our end that needs to be turned on for notification emails to be sent to the participants? We did try using the responseRequested flag in the body but that did not seem to make a difference. We are not using a trial version which I saw a few posts suggesting caused the issue.

Posting here based on : https://answers.microsoft.com/en-us/msoffice/forum/all/email-notifications-not-being-sent-while-creating/87a0f859-68f8-4f06-bc49-a3334f801186

Thanks,
Rohit.

Answer 1

Hello @Rohit Vuppuluri ,

Thanks for reaching Microsoft Graph Q&A forum!

As per the case description, if you are able to send events using Graph Explorer, you are definitely not experiencing fix-error-code-5-7-700-through-5-7-750, which generally happens to trial and/or new tenants.
Are you getting 20x Ok success message response for Graph API POST /users/{id | userPrincipalName}/events?
If event is created and can be seen in sentItems of sender/organizer, then checking mail traces and routing through admin portal would give some idea why the mail is not delivered to attendees.

You can also raise a support case with Microsoft, a specialized Support Engineer will be able to assist you better who will be having tools so analyze mail routing and provide a better and faster resolution.

You can raise technical support request from:
https://portal.azure.com/#view/Microsoft_Azure_Support/HelpAndSupportBlade/~/overview or https://admin.microsoft.com/#/support/requests.

Hope this helps.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".