Microsoft Teams experiences a "couldn't connect" issue after recent sidebar update, but a fix has been rolling out.
Microsoft Teams users worldwide have been encountering a service degradation issue, causing a "couldn't connect to this app" error after a recent left sidebar interface update. The update, intended to enhance the platform's user interface, inadvertently enabled an unoptimized code flow, which disrupts the app's initialization process.
Despite this disruption, the core Teams functionality remains intact, and there are no security risks involved. To work around the connectivity error, users can bypass the issue by clicking directly on the “Activity” or “Chat” icons in the left-hand sidebar, allowing access to all features without error. Clearing the Teams cache and restarting the app may also help in resolving other UI-related issues.
The service degradation issue is classified as a disruptive bug, but the core service remains operational. Microsoft is deploying a fix for this issue, and as of August 19, 2025, approximately 25% of the global Teams infrastructure has received the corrective patch. The company expects to complete the deployment and fully remediate the issue by its next scheduled communication.
The issue, tracked under Microsoft reference TM1131505, impacts a broad scope of users across organizations that rely on the collaboration platform. It is confined to the initial loading sequence of the Teams desktop and web clients.
Regarding security, Microsoft confirmed these incidents pose no security risk or data exposure related to these issues. Concerning the CVE-2025-53783 vulnerability mentioned, the current search results do not provide any details or connection to this CVE in relation to Microsoft Teams or these service degradations. There is no public record in the provided results indicating it is linked to the Teams issues or any unoptimized code flows reported here.
In summary, Microsoft Teams users are experiencing a "couldn’t connect" error due to an unoptimized sidebar code flow after an update. To work around the error, users can click on the "Activity" or "Chat" icons in the sidebar. The deployment of the corrective patch for the Microsoft Teams service degradation issue is currently underway, and the company expects to complete it soon. The issue does not pose any security risks.
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