Microsoft’s Microsoft Teams desktop client has been plagued by a known issue that’s causing some users to experience delays or even being blocked from opening the application on their Windows systems. The company acknowledged this problem on Thursday, advising affected customers to work around it by using the web or mobile platforms in the meantime.
The issue, tracked as TM1466820, is causing some users to be unable to load the client or experiencing loading delays of up to two minutes when first opening Microsoft Teams on Windows devices. While Microsoft is still analyzing service logs and telemetry data to identify the root cause, it has reached out to affected users to gather more information and determine potential mitigation options.
This isn’t an isolated incident, as Microsoft is currently investigating another issue affecting Mac users who are unable to join Teams calls and meetings, tracked as TM1466659. Initially, the company suspected a code change was causing the problem, but after further review, it’s reassessing its understanding of the root cause. This has resulted in ongoing disruptions for some users.
The problems plaguing Microsoft Teams come at a time when the service is more critical than ever, especially with the rise of remote work and hybrid teams. The fact that these issues are affecting users’ ability to communicate and collaborate is a significant concern. It highlights the importance of robust cybersecurity measures not only in preventing initial breaches but also in detecting and responding to ongoing attacks.
Microsoft has been busy resolving various other issues recently, including one that blocked some Microsoft Teams Free users from chatting and calling others in April. This latest problem underscores the need for continuous monitoring and maintenance of critical applications like Microsoft Teams. As more organizations rely on cloud-based services for their daily operations, it’s essential to stay vigilant about potential disruptions.
For those affected by this issue, using the web or mobile platforms as a temporary workaround is recommended until Microsoft resolves the problem. The company will continue to analyze service logs and telemetry data to identify the root cause and determine mitigation options. In the meantime, users can take steps to minimize their reliance on the desktop client and explore alternative communication methods.
As cybersecurity professionals and end-users alike, it’s essential to remember that even with robust security measures in place, issues like this can still occur. It’s crucial to stay informed about potential disruptions and be prepared to adapt quickly when necessary.
Source: Bleeping Computer — 2026-09-04