To control what external (guest) users can do in Microsoft Teams — such as screen sharing, editing sent messages, and deleting messages — you need to configure the Guest access settings in the Microsoft Teams admin center.

✅ Guest access

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📌 Explanation:

To control what external (guest) users can do in Microsoft Teams — such as screen sharing, editing sent messages, and deleting messages — you need to configure the Guest access settings in the Microsoft Teams admin center.

These settings allow you to:

• Enable or disable screen sharing for guests
• Allow guests to edit or delete their sent messages
• Control other collaboration features like calling, meeting participation, and file sharing

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❌ Why the other options are incorrect:

• External access: Controls federated chat with users from other domains (not guest users added to teams).
• Teams policies: Apply to internal users, not guests.
• Teams settings: Org-wide settings for Teams features, but not specific to guest permissions.

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