To remove an account from an OU, perform the following steps:

1. If you wish to remove an account from an OU, you have two options. You can move it to another OU, or you can move it back to the root. If you decide you want to delete an OU, you'll need to make sure no accounts exist inside it first (we'll show you how to do this next).

2. Run the following command to move an account back to the root:

        aws organizations move-account 
          --account-id <twelve-digit-account-id> 
          --source-parent-id <existing-parent-ou-id> 
          --destination-parent-id <root-id>