Microsoft Teams is adding a new meeting-security option that can automatically block identified external meeting bots from joining meetings. That includes the type of third-party bot commonly used by AI note-taking and transcription services.
Microsoft published the change in Message Center notice MC1459141 on 21 August 2026 and materially updated it on 24 August 2026. General availability is due to begin in late August and complete by late September.
The setting will be off by default. Nothing changes unless a Teams administrator enables it through meeting policy.
What is Microsoft changing in Teams?
Teams can already identify some external meeting bots and show information about them to organisers and administrators. The new policy adds an enforcement option: when enabled, an identified external meeting bot can be prevented from joining.
Administrators will be able to assign the policy to selected users or groups rather than treating every meeting in the organisation identically.
Microsoft describes it as an additional control for organisations that want to reduce the risks created by automated meeting applications joining calls.
What counts as an external meeting bot?
An external meeting bot is an automated participant operated outside your Microsoft 365 organisation. Many third-party AI note-takers work this way: the service joins the meeting as a visible participant, listens to the conversation, and may create a recording, transcript or summary.
The new feature concerns bots that Teams identifies as external meeting bots. Microsoft has not said that it will detect every possible automated service, and the policy should not be treated as a complete replacement for sensible meeting controls and staff guidance.
When will automatic bot blocking arrive?
- Targeted Release: early August to late August 2026.
- General Availability worldwide and GCC: late August to late September 2026.
As with other Microsoft 365 changes, individual tenants may receive the option at different points within the rollout window.
Do You Know Which AI Bots Join Your Meetings?
Third-party note-takers can be useful, but they may also record, transcribe and store sensitive conversations outside Microsoft 365. KES can help you review the tools, permissions and meeting policies your business is using.
Microsoft says the new setting will be off by default. Businesses must review their legitimate bot use before deciding which users or groups should receive the blocking policy.
Read our AI note-taker privacy guide →Will Teams block AI note-takers automatically?
No. Microsoft says the new policy is off by default. Organisations that do nothing will keep the current behaviour, where Teams identifies supported bots and provides visibility but does not automatically prevent them joining.
That is important because some businesses deliberately use approved note-taking or workflow bots. Switching on a blanket block without checking those workflows could stop legitimate tools from joining meetings.
Why might a business want to block meeting bots?
An external AI note-taker can create a second copy of a sensitive business conversation outside the Microsoft 365 tenant. Depending on the service and its configuration, recordings or transcripts may be stored by another provider, shared with meeting participants, retained for an extended period or used by integrations.
That does not mean every meeting bot is unsafe. It means the business should know which services are approved, where their data goes and whether participants understand that the meeting is being recorded or transcribed.
Our guide to who can see what an AI note-taker records explains those questions in more detail.
What should businesses do before enabling it?
- List the meeting bots staff currently use. Include AI note-takers, transcription services and workflow tools.
- Separate approved tools from unknown ones. Check contracts, privacy terms, storage location, retention and access controls.
- Pilot the Teams policy. Microsoft recommends testing with a small group before wider deployment.
- Choose the right scope. Higher-risk teams such as finance, HR, legal or board users may need stricter rules than general meetings.
- Update user guidance. Explain what organisers should do when an unexpected bot appears.
- Keep meeting consent in mind. Blocking technology does not remove the need for clear recording and transcription practices.
Quick answers
Can Microsoft Teams block AI note-taking bots?
Teams is gaining a meeting policy that can automatically block external meeting bots identified by Microsoft. It is scheduled for worldwide rollout between late August and late September 2026.
Is the setting switched on by default?
No. Microsoft says it will be off by default and must be enabled by an administrator.
Can it be applied only to some staff?
Yes. Microsoft says the policy can be assigned to specific users or groups through existing Teams meeting-policy management.
Will it detect every AI note-taker?
Microsoft refers specifically to identified external meeting bots. Businesses should not assume that one setting detects every automated tool or every method of recording a meeting.
The important point
Microsoft is giving businesses a useful new control over third-party bots in Teams meetings, but the right starting point is visibility rather than an immediate blanket block.
Find out which AI note-taking services staff actually use, decide which are approved, then pilot the policy with the people who handle the most sensitive conversations. Because the setting is off by default, organisations that want the protection will need to take deliberate action.
KES provides ongoing Microsoft 365 monitoring, security and management for UK businesses that want help keeping up with changes like this.
