check before: 2024-08-15
Product:
Microsoft 365 Apps, Skype for Business, Teams
Platform:
Online, World tenant
Status:
Change type:
Feature update, User impact, Admin impact
Links:
Details:
Summary:
Microsoft Teams has introduced a new admin control to block external access with Teams trial-only tenants. This setting, which defaults to 'Blocked', aims to protect against malicious activities. Admins can review and update this setting using PowerShell commands. General availability of this feature started on August 15, 2024.
Details:
As communicated in MC805200 Microsoft Teams: Tenant Federation setting to control external access with trial-only tenants (June 2024), we introduced a new admin control to enable you to block external access (federation) with Teams trial-only tenants. Some malicious actors have used free Teams trials to launch phishing or abuse attacks against Teams users. With this setting you can add another layer of protection for users against some of these attacks.
Between June 2024 and August 2024, we provided a 45-day window to allow you to review and update the setting before enforcement began. Now, by default, this new setting will block external access with trial-only tenants and requires explicit action from you to continue to federate with trial tenants.
[When this will happen:]
General Availability (Worldwide): Available now. Blocking or allowing external access with trial-only tenants with this setting was enabled August 15, 2024. If you missed MC805200, you can still manage the setting for your organization at any time.
Change Category:
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Scope:
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Release Phase:
Created:
2024-08-24
updated:
2024-08-24
Task Type
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Docu to Check
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MS How does it affect me
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linked item details
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Direct effects for Operations**
Blocked External Communication
Users will be unable to communicate with users from trial-only tenants, leading to potential disruptions in collaboration and communication.
- roles: IT Admin, End User
- references: https://learn.microsoft.com/en-us/powershell/module/teams/set-cstenantfederationconfiguration?view=teams-ps&viewFallbackFrom=skype-ps, https://learn.microsoft.com/microsoftteams/trusted-organizations-external-meetings-chat?tabs=organization-settings
Loss of Existing Chats
Users from trial-only tenants will be removed from any existing chats, which may lead to loss of important communication history and context.
- roles: End User, Team Leader
- references: https://learn.microsoft.com/en-us/powershell/module/teams/set-cstenantfederationconfiguration?view=teams-ps&viewFallbackFrom=skype-ps, https://learn.microsoft.com/microsoftteams/trusted-organizations-external-meetings-chat?tabs=organization-settings
Increased Risk of Phishing Attacks
Without proper configuration, users may be exposed to phishing attempts from trial-only tenants, as malicious actors exploit the lack of restrictions.
- roles: IT Admin, Security Officer
- references: https://learn.microsoft.com/en-us/powershell/module/teams/set-cstenantfederationconfiguration?view=teams-ps&viewFallbackFrom=skype-ps, https://learn.microsoft.com/microsoftteams/trusted-organizations-external-meetings-chat?tabs=organization-settings
Configutation Options**
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Opportunities**
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Potentional Risks**
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IT Security**
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** AI generated content. This information must be reviewed before use.
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