If you want to make someone an owner or view who's an owner of an existing team, go to the team name and click More options > Manage team.
The Role column tells you if someone is a team member or owner. To make someone an owner, click Member and then select Owner.
You can also make someone a team owner while you're creating a team. When you're adding team members, designate whether each new person is going to be a team member or team owner by clicking Owner under the Member menu.
Tap Teams , go to the team name, and tap More options > View members. If you're a team owner, you can make someone a team owner by tapping a user profile and choosing Make owner.
If you're a team owner, tap Teams , go to the team name, and tap More options > Manage members.
Go to the desktop and web app for now to make someone a team owner or see who's already an owner.