To delete a poll:

  1. Go to the Polly tab from the same channel as the poll you want to delete
  2. For any poll that you’ve authored, you should see 3 dots in the top right corner of the poll card
  3. Click on ‘Delete’

microsoft-teams-delete-poll-menu

This will delete the poll from the scorecard and the conversations stream. At this time deleting a poll does not work from your Microsoft Teams mobile app, and you’ll need to complete the action in your browser or your desktop application.