Microsoft has acknowledged an issue affecting screen sharing on Teams for macOS, where users encounter blank or frozen screens during meetings. This problem is prevalent among those using macOS versions prior to Tahoe 26.4, as revealed in update MC1392559 from Microsoft’s Message Center.
Impact on Users and Devices
Users experiencing this issue may notice their screen sharing sessions either stop unexpectedly or fail to initiate. The problem is particularly noticeable on systems with low memory or high disk usage, especially when running outdated macOS versions. This bug is significantly impacting organizations utilizing Microsoft 365 Government cloud environments, including GCC, GCC High, and DoD tenants.
Timeline for Resolution
Initially, Microsoft planned to provide in-product guidance by late June, but this has been postponed to late July 2026, with full deployment expected by mid-August 2026. Once the update is live, Teams will automatically prompt users to retry sharing and recommend a macOS update if necessary. This feature will be enabled by default, eliminating the need for any admin configuration.
Immediate Solutions and Recommendations
While waiting for the automatic guidance, users can resolve the issue by updating their macOS to Tahoe 26.4 or later. Alternatively, enabling ‘Use Mac OS native sharing’ in Teams’ settings offers a quick fix without needing a restart. Microsoft advises organizations to identify users on older macOS versions and inform them of the potential symptoms.
IT admins are encouraged to deploy macOS updates where possible and update helpdesk resources to include information on the symptoms, the macOS update solution, and the native sharing workaround. Support teams should be prepared to assist users who require administrative rights for system updates.
Microsoft has assured that there are no compliance issues related to this bug, but organizations are advised to review it in accordance with their internal policies. As a proactive measure, admins should ensure all users are informed and prepared for potential disruptions.
