If you have pressed the "End Meeting" button but attendees are still in the meeting, it may be due to a delay in the system processing the end command. Unfortunately, once the meeting is ended, you cannot re-enter it to remove attendees or end it again.
To ensure that the meeting is officially ended for all participants, you may need to wait a bit longer for the system to process the end command. However, if the meeting continues to show as active after a significant amount of time, you might want to check the Teams admin center or contact your IT support for assistance. They may be able to provide insights or take action to resolve the issue.
For future webinars, ensure that you communicate with attendees about the meeting's end time and encourage them to leave once the meeting is concluded. This can help prevent similar situations from occurring.