sporadic issue where a user "accepts" a meeting invite from an organizer and the invitee's mailbox sends the same "accepted" email notification over and over to the organizer.

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sporadic issue where a user "accepts" a meeting invite from an organizer and the invitee's mailbox sends the same "accepted" email notification over and over to the organizer.

Anonymous

I am seeing a sporadic issue where a user "accepts" a meeting invite from a meeting organizer and the invitee's mailbox keeps sending the same "accepted" email notification over and over to the organizer. The repeat notifications continue to be generated continuously even after the meeting has happened.

The only way I have found to stop the "accepted" emails is to have the meeting organizer either delete the event entirely and recreate it, or remove the specific user that is generating the messages and simply not invite them again. Neither one of these are good solutions, i'd like Microsoft to dig in and see what the root cause is.

See the image of a message trace I ran the last time this happened to one or our users. It shows the same "accepted" email being sent by the same mailbox over and over to the original meeting organizer. And the image is just 1 morning of a longer time frame. If we just let it go, hundreds or thousands of emails would have been sent in total.

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3 answers

Answer 1

Exchange Online
This has happened to multiple users, so it's not isolated
The user has new Outlook client on their work PC
It seems the device does have an impact on whether multiple emails are sent or not, details below
The issue is not add-in related as I have seen it occur with no add-ins installed on a client
I have been unable to get the client version thus far, will provide it as soon as I can

**Additional Info**

Since my initial post, I have determined at least one cause of this issue (not sure if there are multiple causes yet). One of my users accepted a calendar invite on their iPhone (via the default Mail app) and by accepting, the event gets added to the default Calendar app. Now, every time she opens the calendar app on her phone, a new "accepted" email is generated and sent to the organizer. The user has her work 365 account added to her iphone as an account in settings, that's how the Mail and Calendar apps are syncing.

So, I can't tell if this is really an issue on Apple's side or Microsoft, but its unfortunate because I have little hope that they will work together on a solution.

Answer 2

Dear Tyler Stange,

Many thanks for your kind and detailed response,

I greatly appreciate your time and effort to narrow down this issue from your side. Since multiple users in your organization experiencing same issue, it seems account related issue. As you mentioned, when the users accepting calendar invites from their native mail app on iPhone device, there may be something wrong during synchronization. Therefore, this query needs to be checked from backend side and since we are belong to Microsoft Community site, we have limited resource and privilege to examine backend related scenarios. Therefore, for your concern, I sincerely recommend that you contact our dedicated technical support team via admin center Get support - Microsoft 365 admin | Microsoft Learn. Since our dedicated technical support team have more resources and privilege than we do, they will check your query from backend side and will assist you with possible solutions and also if it requires, they will join you in remote session to assist and fix the issue.

Thank you for your precious time and understanding. Have a good day!

Sincerely,

Libeamlak | Microsoft Community Moderator

Answer 3

Dear Tyler Stange,

Good day! Thank you for posting to Microsoft Community. We are happy to assist you.

I'm sorry to hear that you're experiencing this issue with calendar invite accepted in Outlook. I greatly appreciate your time and effort to narrow down the issue from your side. To understand the and narrow down the issue from our side, we need more details from you, please kindly provide us the following information. Thanks in advance!

May I know if you are on Exchange on-premises, Exchange Hybrid or pure Exchange Online?
May I please double confirm if this issue is with specific user accounts or all email account in your organization?
May I please double confirm if the affected user is using classic Outlook or New Outlook client app?
Have you tried to accept the meeting invite from a different device? if not, kindly try to accept the meeting from a different device or Windows user profile with the affected user account to see if the issue persists.
Have you checked if the affected user has any add-ins installed in Outlook that could be causing the issue? if not, you can disable add-ins by going to File > Options > Add-ins or start the affected user Outlook in safe mode, see Open Outlook in safe mode - Microsoft Support and check if there is any difference.
Could you please provide us with the screenshot of your Outlook version details? See What version of Outlook do I have? - Microsoft Support

I look forward to your response. Kindly note that the above requested information is required for further analysis and troubleshooting of your situation. Your patience and cooperation are much appreciated.

Thank you for your precious time. Have a nice day.

Sincerely,

Libeamlak | Microsoft Community Moderator

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sporadic issue where a user "accepts" a meeting invite from an organizer and the invitee's mailbox sends the same "accepted" email notification over and over to the organizer.

3 answers