The notification indicates that legacy Office 365 Connectors have been retired, causing your Teams integration to stop sending alerts. To restore functionality, you must migrate your workflows to Microsoft Graph Webhooks or Power Automate flows immediately, as the old connector endpoints are no longer operational.
Understanding the Deprecation
Microsoft has officially deprecated the original Office 365 Connectors within Teams. This change is part of a broader effort to modernize how external services integrate with Microsoft 365 applications. The legacy connectors relied on older REST API standards that are no longer supported by the platform's security and infrastructure updates. When you see the message "Action Required: O365 connectors within Teams deprecated notifications service stopped," it means the specific webhook URL associated with your channel is now invalid.
This deprecation affects any bot, CI/CD pipeline, monitoring tool, or custom application that was previously posting adaptive cards or simple text messages to a Teams channel via the https://outlook.office.com/webhook/... endpoint. If you do not take action, all incoming notifications from these sources will fail silently or return HTTP errors, leaving your team unaware of critical events.
Migration Options
There are two primary methods for replacing the deprecated connectors, depending on whether you are using a third-party service or building a custom solution.
Option 1: Using Power Automate (Recommended for Low-Code)
For most organizations, migrating to Power Automate is the safest and most maintainable path. Power Automate provides native connectors for many popular services like Azure DevOps, Jira, GitHub, and various cloud providers.
- Navigate to make.powerautomate.com in your browser.
- Create a new automated flow triggered by the event source (e.g., "When a work item is created" in Azure DevOps).
- Add the Post message in a chat or channel action.
- Select your target Teams channel and format the message body using Adaptive Cards if needed.
- Save and test the flow to ensure notifications appear correctly.
This approach also allows you to add logic, such as filtering out non-critical alerts or formatting complex data before it reaches the team channel. It is particularly useful if you manage multiple integrations across different departments.
Option 2: Using Microsoft Graph Webhooks (For Custom Code)
If you have custom code or scripts that previously used the old connector URLs, you must update them to use the Microsoft Graph API. This requires registering an application in the Azure Active Directory portal and configuring appropriate permissions.
- Register App: Go to the Azure Portal and create a new App Registration.
- Set Permissions: Grant the application
ChannelMessage.SendorChatMessage.Sendpermissions under Microsoft Graph. - Generate Token: Your script must now authenticate using OAuth 2.0 to obtain an access token.
- Update Endpoint: Replace the old webhook URL with the Graph API endpoint:
POST https://graph.microsoft.com/v1.0/channels/{id}/messages.
This method offers greater flexibility but requires more development effort to handle token refreshes and error handling. Ensure your code handles rate limits and retries appropriately, as Graph API calls are subject to stricter throttling policies than the legacy connectors.
Impact on Existing Integrations
Until you migrate, any integration relying on the old connector scheme will cease to function. You may notice gaps in your incident response processes, missed build notifications, or lack of updates from monitoring tools. For example, if you were using Azure DevOps to notify your team about pipeline failures, those alerts will stop arriving in Teams.
To mitigate this, audit all channels where you have added "Office 365 Connector" webhooks. Check the channel settings for any connected services and document which ones need migration. Prioritize high-traffic channels that receive frequent alerts, as these are likely to cause the most disruption when they go silent.
While some third-party vendors may still support the old connectors through their own middleware, relying on them is risky. It is better to move directly to supported standards to ensure long-term stability. If you are unsure how to configure your specific tool, check the vendor’s documentation for "Teams Migration Guide" or "Graph API Integration."
Verification Steps
After implementing the new solution, verify that notifications are flowing correctly. Send a test message from your new flow or script and confirm it appears in the designated channel. Additionally, monitor the channel for a few days to ensure no errors are occurring in the background logs of your automation platform.
You can also remove the old connector from the channel settings to avoid confusion. Right-click the channel name, select Manage Channel, and delete any existing Office 365 Connector entries. This cleanup step helps prevent accidental re-use of deprecated endpoints.
Frequently Asked Questions
Can I re-enable the old Office 365 Connectors?
No, Microsoft has permanently shut down the backend services for legacy connectors. There is no way to revert this change or re-enable the old webhook URLs, so migration is mandatory.
Will my existing chat history be affected?
No, past messages posted via connectors remain visible in the channel history. Only new posts sent after the deactivation date will fail, so your historical data remains intact.
Is there a cost associated with using Power Automate?
Power Automate is included in many Microsoft 365 business plans, but advanced features or higher run limits may require additional licensing. Check your organization’s admin center to confirm your current plan’s capabilities.
How do I troubleshoot if my new Graph API webhook fails?
Check the authentication tokens first, ensuring they are valid and not expired. Then verify that the app registration has the correct ChannelMessage.Send permissions and that the channel ID in the URL is accurate.
Are there alternatives to Power Automate for non-Microsoft users?
Yes, you can use direct Microsoft Graph API calls from any programming language that supports HTTP requests. This gives you full control over the payload and authentication process without relying on the Power Platform.