Meeting got cancelled when new members were added for Microsoft group with 500+ members and disabled the forwarding

Question

Meeting got cancelled when new members were added for Microsoft group with 500+ members and disabled the forwarding

Sneha Gawali 0

We have created an invite for Microsoft group with 500+ members and disabled the forwarding. We had a request to add new members. I have added the members and select send update only to new members added. As soon as I did that, the invite got cancelled. We need to know alternate solution of forwarding an invite when the meeting is disabled.

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Jamie Maguire 0 Reputation points

2026-09-17T11:53:34.6933333+00:00

Hello,

I have had this issue for months with meeting invites as small as two people. When adding attendees, it cancels the invite for everyone else.

I see this has been a problem for folks since at least 2024. Are you expecting to resolve this serious issue, or do you plan on continuing to let it be a seriously problematic feature for your users?
Hornblower409 15,140 Reputation points

2026-09-18T05:26:28+00:00

@Jamie Maguire said

I have had this issue for months with meeting invites as small as two people

I understand that you have the same or similar issue to the one discussed in this thread. But you will not get any help by adding to an old post.

I would suggest that you start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem and what steps you have already tried to fix it.

This provides much higher visibility to your issue than adding on to an existing post, which is only seen by people who are already following this question.
Jamie Maguire 0 Reputation points

2026-09-18T10:34:08.69+00:00

I won’t get help posting anywhere. This is an existing glitch effecting thousands of people and they haven’t fixed it in years

1 answer

Jamie Maguire 0 Reputation points

2026-09-17T11:53:34.6933333+00:00

Hello,

I have had this issue for months with meeting invites as small as two people. When adding attendees, it cancels the invite for everyone else.

I see this has been a problem for folks since at least 2024. Are you expecting to resolve this serious issue, or do you plan on continuing to let it be a seriously problematic feature for your users?
Hornblower409 15,140 Reputation points

2026-09-18T05:26:28+00:00

@Jamie Maguire said

I have had this issue for months with meeting invites as small as two people

I understand that you have the same or similar issue to the one discussed in this thread. But you will not get any help by adding to an old post.

I would suggest that you start a new thread using the "Ask a question" button at the top of this page to create a new Question and include the details for your specific problem and what steps you have already tried to fix it.

This provides much higher visibility to your issue than adding on to an existing post, which is only seen by people who are already following this question.
Jamie Maguire 0 Reputation points

2026-09-18T10:34:08.69+00:00

I won’t get help posting anywhere. This is an existing glitch effecting thousands of people and they haven’t fixed it in years

Answer 1

Hi @Sneha Gawali,

Thank you for posting your question in the Microsoft Q&A forum.

The issue you're experiencing is a known behavior in Microsoft Outlook. When adding new members to a meeting with over 500 attendees and selecting "Send update only to added or removed attendees", Outlook may automatically cancel the invitation for existing members. This happens due to limitations in how Outlook handles large attendee lists.

Could you confirm if this issue occurred on Outlook Web? If not, as a temporary workaround, you might consider using Outlook Web instead.

Alternatively, you might also consider using a Distribution Group. Instead of adding individual members to the meeting, you can:

Create a Distribution List that includes all intended participants.
Send the meeting invitation to the Distribution List.
When new members need to be added:

Add them to the Distribution List first.
Then send the meeting update to the entire list.

Since a Distribution List counts as a single recipient, it helps avoid exceeding Outlook’s limits.

For your reference:

Create distribution lists - Microsoft 365 admin | Microsoft Learn (if have admin rights)
Create a distribution list in Outlook - Microsoft Support

Please let me know if you have any updates or need further assistance. I'm happy to help!

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

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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Anonymous

2025-08-03T07:25:19.6266667+00:00

Hi @Sneha Gawali,

Is there any update on this thread? If the issue has been resolved, please mark the helpful replies as "Accept Answer". This helps others in the community facing similar problems. Thanks for your understanding.
Anonymous

2025-08-04T07:09:21.91+00:00

Hi @Sneha Gawali,

I hope this message finds you well.

This is my second follow-up to check whether your issue has been resolved. I truly want to ensure your experience is as smooth as possible. If your problem is still ongoing or if you have faced any new difficulties, please share more details about the current steps you are stuck on. I am here and happy to provide further help whenever you need it.

While waiting for your response, I will continue tracking other customer questions on the forum to ensure everyone receives timely support. If you have additional questions, please feel free to tag my name in your reply so I can assist you promptly and more personally.

Looking forward to hearing from you soon.