Unexpected meeting invites in Exchange Online

A user in Exchange Online is receiving invites that were created for another user in the same organization. Note the receiving user did have Read/Manage permissions and send on behalf permissions for his mailbox that were removed but issue still persists,

Check for a sharing entry for receiving user with setting Send invitations and responses to set to 'Delegate and send me a copy' and remove it to resolve the issue. Check the below steps,

After you've given someone delegate access to your calendar, you'll see an additional option in Sharing and permissions that lets you control how meeting requests and responses are processed. If you have multiple delegates, this option will apply for all of your delegates.

To set these options:

1. In Outlook on the web, select  at the bottom of the page.

2. At the top of the page, select Share > Calendar.

   

3. Under Delegates, next to Send invitations and responses to, select one of the following options:

   • Delegate only Meeting requests and responses go only to your delegates.

   • Delegate and send me a copy Meeting requests and responses are sent to you and your delegates. Only your delegates see the option to accept or decline a meeting request, and the notification sent to you will appear like a normal email message. You can still respond to the meeting by opening the calendar item and responding.

   • Both my delegate and me Meeting requests and responses are sent both to you and your delegates. Either of you can respond to the meeting invitation.