**To register an existing or disabled entity** This example enables an existing entity (user, group, or resource) to use Amazon WorkMail. Command:: aws workmail register-to-work-mail --organization-id m-d281d0a2fd824be5b6cd3d3ce909fd27 --entity-id S-1-1-11-1122222222-2222233333-3333334444-4444 --email exampleGroup1@site.awsapps.com Output:: None