Microsoft is currently investigating an issue impacting the calling functionality in its Teams application. This disruption is preventing certain users from making or receiving calls through the platform, according to the company’s announcement via the Microsoft 365 Status account on September 21. Administrators are advised to refer to incident TM1475580 in the Microsoft 365 admin center for specific details.
Impact and Scope of the Service Incident
The advisory notes that the problem is affecting only ‘some users,’ but does not specify regions, customer segments, or the type of calls affected. The lack of detailed information leaves businesses uncertain about the full extent of the disruption, emphasizing the need for organizations to assess their own systems for any related issues.
While the issue is currently limited to calls, organizations are cautioned against assuming other features like chat, messaging, or file sharing are unaffected unless their telemetry suggests otherwise. The incident could impact critical business operations such as help desks, contact centers, and executive communications.
Operational Considerations for Businesses
For IT and security teams, distinguishing between this service-side issue and potential local faults or malicious activities is crucial. Administrators are encouraged to examine user reports alongside Microsoft’s advisory and review network, endpoint, and identity logs to rule out other causes.
To manage the disruption, administrators should log into the admin center to check for tenant-specific impact statements and updates related to TM1475580. The admin center remains the primary source for understanding an organization’s specific exposure to the issue.
Maintaining Communication and Security
During the ongoing investigation, businesses are urged to implement resilient communication plans. This might involve using PSTN calling, designated conference bridges, or corporate mobile phones as interim solutions, rather than altering existing configurations broadly.
Employees should be reminded to rely on approved tools for sensitive discussions, as unexpected outages can increase the risks of phishing attacks, fake support communications, and unauthorized data exchanges.
Microsoft’s investigation into the Teams calling issue continues. Administrators are advised to keep track of the incident’s progress, share updates internally, and revert any temporary strategies once Microsoft confirms the restoration of normal service.
For businesses, this incident underscores the importance of having robust contingency plans to ensure continuity and security in communication operations.
