There are a number of reasons why attendees may still be called for a scheduled meeting.
Meeting is cancelled from an iPhone - Unfortunately, the .ics file that is needed for firstname.lastname@example.org to understand that a meeting has been cancelled is not sent if the meeting organizer uses the iPhone calendar application to cancel a meeting. Please use your desktop calendar application to cancel Amazon Chime meetings.
When the meeting organizer has removed a single user from a meeting - Organizers, please be sure to choose to send the update to all after removing an invited user from a meeting. If you don't send an update to email@example.com we will not know about the update.