Determine Teams channel and group membership

How to find a list of Teams channels and see the owners/members:

1. Open in a browser: https://portal.office.com/Adminportal/
2. Click the ‘Teams and groups’ item in the left pane.
3. Click ‘Active teams and groups’.
4. In the search box, type your search term.
5. Click the Team in question.
6. Click the ‘Membership’ tab.
7. The list of Owners is displayed by default.
8. Click the ‘Members’ item to show the other members of the Team.