How do I leave a Client Account when I no longer support them?

Option 1- Leave a group using Microsoft Teams

You can leave a team at any time by choosing the team name, and then selecting More options  > Leave the team.

You'll receive a confirmation message to make sure that you want to leave the team.

Option 2 - Leave the group from Outlook on the Web

In the left pane, under Groups, select the group you want to leave.

At the top of the message list, select  > Settings.

Select Leave group.