This article explains how to remove a member from a Teams Team.
Step 1: Open the team that you wish to remove a member from. Click on the 3 dots next to the team name. This has been outlined below.
Step 2: Click the "Manage team" option. See below for reference.
Step 3: Navigate to the "Members" tab. Expand the "Members and guests" header. Find the member you wish to remove from the team and click the "X" next to there name. See the "jtest" member below for reference.
Step 4: Below you can see the "jtest" member has been removed from the Team.
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