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Asger-6315 asked ChristyZhang-MSFT edited

Warning message about calendar not being primary when adding new attendee to meeting in Outlook 365 - but it is

A colleague has an issue where adding an extra attendee to an existing meeting in Outlook 365 sometimes yields an error.
Running Windows 10 x64, Outlook Click-to-run edition, connecting to an Exchange Online server.

The extra attendee is usually added in the Optional field. User then sometimes gets told (the following is translated, so wording might be slightly off):

"This meeting isn't on your primary calendar. Attendee responses won't be displayed in the meeting, but you can still receive responses in email. Do you want to send anyway?

However, this is his primary calendar, so the message is incorrect - and he needs responses to display in the meeting.

Please advise. Thanks in advance.

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Hi @Asger-6315

Welcome to our forum!

What's the version of your Outlook? (File > Office Account > About Outlook). Please make sure you have upgraded your Outlook to the latest version.

In order to better solve your problem, would you like to provide more information about your issue for our better research?

  • Have you done any specific operations before you added an extra attendee? Such as moving the meeting to another calendar folder?

  • Can you add an extra attendee in owa successfully?

  • > A colleague has an issue where adding an extra attendee to an existing meeting in Outlook 365 sometimes yields an error.
    And I noticed that the issue occurs sometime, right? If so, What do the meetings with problems have in common? And do other users in your organization encounter the same issue?

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Asger-6315 avatar image Asger-6315 ChristyZhang-MSFT ·

Hi Christy,

thanks for responding.

Yes, user has latest version - 2203 Build 16.0.15028.20218 64-bit.

  • No, meeting has not been moved - it's a matter of adding a function mailbox (from CRM system) as an optional attendee at some point after the meeting has been created, and Outlook sometimes responds to that action with the warning message I stated above.

  • I can ask user to test next time he gets the error to try the same action in OWA - would that be recommended as a troubleshooting step?

  • Yes, issue is intermittent, and we have not been able to find a common denominator, unfortunately. We are a small business, so this user is currently the only one needing this functionality, I believe (and thus the only one experiencing it).

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Hi @Asger-6315

Thanks for your reply!

Have you taken the time to test on OWA recently?

And i noticed that the issue occur when adding a function mailbox as an optional attendee, what about adding other users?

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