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Due to issue in MS Graph PowerShell (Version 2.27.0 or 2.28.0), API call is used to retrieve external membership.
Find All External Members in Teams Channels
Execute this PowerShell script to list all Teams Channels with external members, ensuring secure external collaboration in Microsoft Teams.
Sample Output
The script exports two CSV files: a detailed report showing external users in channels and a summary report with guest user counts across all channels. The sample output is shown in the screenshot below.
Detailed report: Teams Channels and their external user details
Summary report: Teams Channels and their guest users count
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