Unable to cancel recurring Teams meeting (shared mailbox)

Question

Unable to cancel recurring Teams meeting (shared mailbox)

SmartHead Co 0

Hello,

I am experiencing an issue with a recurring Microsoft Teams meeting that I am unable to edit or cancel.

The meeting was created from a shared mailbox ([Moderator note: personal info removed] Co.), and I am not able to manage the meeting series. Although I can see the meeting in my calendar, I do not have sufficient permissions to modify or cancel it.

Additionally, when I try to open the meeting details in Microsoft Teams, the window renders incorrectly – the content is unreadable and no actions are available.

I have already tried:

Microsoft Teams (desktop and web)
Outlook Web (outlook.office.com)
Different browsers (Chrome, Edge, Incognito)

None of these attempts resolved the issue.

This is urgent, as the meeting is scheduled for April 16, and I need to cancel the entire series.

Could you please assist with:

Cancelling the recurring meeting series, or
Granting me sufficient permissions, or
Fixing the corrupted meeting object

I am also attaching screenshots for your reference.

Thank you in advance for your help.

Best regards, Martina

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SmartHead Co 0

[Moderator note: personal info removed]

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Answer 4

Demi-N 17,400 Microsoft External Staff Moderator

Hello @SmartHead Co,

Thank you for sharing the details so far. To make sure I fully understand the situation and can suggest the most appropriate next steps, I’d like to clarify a few points with you.

Could you please confirm whether the recurring Teams meeting was created and hosted by the shared mailbox account?

Additionally, we would appreciate it if you could confirm your role for this meeting, specifically whether your account is assigned as a co‑organizer or an attendee?

If your goal is simply to remove the meeting from your own calendar, you should be able to do this by selecting "Decline". This will cancel the meeting only for you as an attendee.

User's image

However, if the requirement is to edit or cancel the entire recurring meeting series for all participants, this would require organizer‑level access. Since the meeting was created from a shared mailbox, one possible approach would be to convert the shared mailbox into a regular user mailbox, assign it an Exchange license, and then sign in directly to that mailbox to manage and make changes to the meeting.

For your reference: Convert a mailbox in Exchange Online | Microsoft Learn

To help me better understand what you’re seeing on your side, could you please also share a screenshot of the meeting details or the Teams/Outlook UI where the issue occurs? This would make it easier to confirm whether the behavior matches what we typically see in this scenario.

Before suggesting any concrete action, I want to ensure the above understanding is accurate. Please understand that our initial response may not immediately resolve the issue. Your confirmation on these points will help us work together toward a solution.

Thank you for your patience, and I look forward to your response.

Kind regards,

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SmartHead Co 0 Reputation points

2026-04-14T10:01:11.85+00:00
Thank you for your response.

Based on what I can see, the meeting appears to have been created from a shared mailbox (SmartHead Co.), which is shown as the organizer.

Unfortunately, I am unable to access the meeting details properly – the Teams/Outlook UI does not load correctly, so I cannot verify additional details such as co-organizer roles or the full meeting series configuration.

This meeting series was created by a previous colleague, and I no longer have access to that account or its setup.

My requirement is to cancel the entire recurring meeting series for all participants, not just remove it from my calendar.

At this point, I do not have:

organizer-level access

access to the shared mailbox

ability to open or edit the meeting

Therefore, I would appreciate your assistance with one of the following:

cancelling the meeting series from the backend, or

advising how this can be resolved without access to the original organizer mailbox

Please note that this is urgent, as the meeting is visible in calendars of multiple participants, including VIP attendees.

I am attaching screenshots showing the UI issue for your reference.

Thank you for your support.Thank you for your response.

Based on what I can see, the meeting appears to have been created from a shared mailbox (SmartHead Co.), which is shown as the organizer.

Unfortunately, I am unable to access the meeting details properly – the Teams/Outlook UI does not load correctly, so I cannot verify additional details such as co-organizer roles or the full meeting series configuration.

This meeting series was created by a previous colleague, and I no longer have access to that account or its setup.

My requirement is to cancel the entire recurring meeting series for all participants, not just remove it from my calendar.

At this point, I do not have:

organizer-level access

access to the shared mailbox

ability to open or edit the meeting

Therefore, I would appreciate your assistance with one of the following:

cancelling the meeting series from the backend, or

advising how this can be resolved without access to the original organizer mailbox

Please note that this is urgent, as the meeting is visible in calendars of multiple participants, including VIP attendees.

I am attaching screenshots showing the UI issue for your reference.

Thank you for your support.Screenshot 2026-04-14 at 08.55.08.png
SmartHead Co 0 Reputation points

2026-04-14T10:01:32.8266667+00:00

[Moderator note: personal info removed]
SmartHead Co 0 Reputation points

2026-04-14T10:02:56.61+00:00

[Moderator note: personal info removed]
Demi-N 17,400 Reputation points Microsoft External Staff Moderator

2026-04-14T10:33:36.4566667+00:00
Hi @SmartHead Co,

Thank you very much for the detailed clarification and for sharing the screenshots. That helps confirm the scenario quite clearly.

In this situation, the key limitation is that shared mailboxes cannot fully manage or control Teams meetings, especially recurring series, because they do not function as full user identities in Microsoft Teams.

To proceed, the only practical and supported way to cancel or modify the entire recurring meeting series is as follows:

Your IT administrator must convert the shared mailbox into a regular user mailbox. The IT admin will need to:

Assign an Exchange Online license to that account,

Convert the mailbox from shared to regular

Then sign in directly as that mailbox and cancel or modify the meeting series from there.

Only an IT administrator has the necessary access to perform these steps through the Microsoft 365 Admin Center and Exchange Admin Center. This cannot be done by an end user or from within Teams alone.

Given the urgency and the visibility of this meeting across multiple calendars, I recommend escalating this internally to your IT admin as soon as possible so they can take action.

Please let me know once you’ve been able to involve your IT admin, or if they have any follow‑up questions, I’ll be happy to assist further.

Kind regards,
SmartHead Co 0 Reputation points

2026-04-15T05:17:56.13+00:00

Hello Demi, thank you for your detailed explanation.

We are a small startup and do not have a dedicated IT administrator or internal IT support.

Given the urgency of the situation I would greatly appreciate if you could advise whether there is any alternative way to cancel the meeting series without requiring full admin intervention, or if this can be handled from your side.

Thank you in advance for your guidance!
SmartHead Co 0 Reputation points

2026-04-15T07:40:37.24+00:00

We are currently unable to identify who has admin access to our Microsoft 365 tenant.

This was a one-purpose Teams/shared mailbox account that was originally set up by a former colleague, and we no longer have visibility into how it was configured or who holds administrative access.

Could you please help us identify which account has Global Admin (or relevant admin) permissions for this tenant, or how we can recover or determine admin access in this situation?

Thank you in advance.
Demi-N 17,400 Reputation points Microsoft External Staff Moderator

2026-05-04T12:45:42.23+00:00

Hi @SmartHead Co,

Thank you for your message, and I sincerely apologize for the delay in my response.

I understand the urgency of your situation. However, for this type of request, the only supported path is to contact Microsoft Support directly, as they are the only team with the necessary tools and permissions to handle changes related to meeting series or backend configuration.

You can find the official guidance on how to contact Microsoft Support here: Get support - Microsoft 365 admin | Microsoft Learn

They offer both online support options and phone support, depending on your preference and region.

As a community forum moderator, my role is to help guide you toward the correct solution and available support channels. Unfortunately, I do not have access to your environment or the ability to perform actions or make changes on your behalf.

I truly appreciate your understanding, and I hope you’re able to connect with the support team as soon as possible to resolve this.

Please feel free to let me know if you need any guidance while reaching out to support.

Kind regards,

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Unable to cancel recurring Teams meeting (shared mailbox)

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