G Suite admins need to ensure they are fully aware and in control of who has access to thier domain’s Team Drive. You can get the list of your users’ access to different team drives in GAT+ using Drive Audit. Start off by clicking the export button and selecting Export to Google Sheet without paths.
When your data is exported select the ‘Click to view’ option. Once the spreadsheet has loaded create a filter for the type heading by selecting it and then choosing ‘create a new filter view’. Then simply filter out everything except for folders. You should now be able to see all the users who have access to these team drive folders.