Team Members Can Cancel Channel Meetings?

In Teams, the ability to cancel or modify a channel meeting is controlled by meeting policies and not only by organizer/co-organizer or team owner roles.

If a user’s assigned Teams meeting policy allows them to start or schedule channel meetings, they can also manage those meetings in the channel, which can include cancelling them. This is independent of the team’s channel message permissions (such as only being able to delete/edit their own messages) and independent of being the organizer/co-organizer.

To restrict this so that only specific users can start and schedule channel meetings (and therefore cancel them):

1. In the Teams admin center, go to Meetings > Meeting policies and either edit an existing policy or create a new one.
2. Under Meeting scheduling:
   • Turn Meet now in channel meetings to Off to prevent users from starting instant channel meetings.
   • Turn Channel meeting scheduling to Off to prevent users from scheduling channel meetings.
3. Assign this restricted policy to users who should not be able to start/schedule (and effectively cancel/manage) channel meetings.
4. For users who should be allowed to manage channel meetings, use or create a policy where these settings are On.

Alternatively, using PowerShell for a given policy:

Set-CsTeamsMeetingPolicy -Identity <policy name> -AllowMeetNow $False
Set-CsTeamsMeetingPolicy -Identity <policy name> -AllowChannelMeetingScheduling $False

Users with policies where AllowMeetNow and AllowChannelMeetingScheduling are set to $True will retain the ability to start and manage channel meetings, including cancelling them.

References:

• Manage who can start instant meetings and schedule meetings