Microsoft Teams has a known issue affecting screen sharing on macOS

Microsoft has acknowledged an issue in Teams affecting some macOS users. The problem means that versions of macOS prior to Tahoe 26.4 experience blank screen when screen sharing. There is not, as yet, a proper fix – this will be coming some time next month, Microsoft says. In the meantime, however, the company has provided details of a couple of workarounds which it hopes will keep users happy for now. In a message in the Microsoft 365 Message Center, Microsoft says: “Microsoft Teams on macOS (versions earlier than Tahoe 26.4) has a known screen sharing issue causing blank screens, interruptions,... [Continue Reading]

Microsoft Teams has a known issue affecting screen sharing on macOS Microsoft has acknowledged an issue in Teams affecting some macOS users. The problem means that versions of macOS prior to Tahoe 26.4 experience blank screen when screen sharing. There is not, as yet, a proper fix – this will be coming some time next month, Microsoft says.

In the meantime, however, the company has provided details of a couple of workarounds which it hopes will keep users happy for now. In a message in the Microsoft 365 Message Center, Microsoft says: “Microsoft Teams on macOS (versions earlier than Tahoe 26.4) has a known screen sharing issue causing blank screens, interruptions, or failures. In-product guidance will roll out by mid-August 2026.

Users should update macOS to 26.4 or later or enable "Use Mac OS native sharing" in Teams settings”. Going into a little more detail, the company adds: We are informing you of a known issue affecting screen sharing reliability in Microsoft Teams on macOS under certain system conditions and on older macOS versions (earlier than macOS Tahoe 26.4). Users may experience scenarios such as blank or black screen sharing, unexpected interruptions, or failures to start sharing sessions.

To help users recover more quickly and reduce meeting disruption, Teams will begin surfacing in-product guidance when a failure is detected and direct users to relevant documentation and recommended remediation steps, including updating macOS where applicable. Listing the chain of events and what can be done to help, Microsoft explains: - Users may encounter screen sharing issues such as: - Blank or black screens during sharing. - Unexpected interruptions during sharing sessions.

- Failure to start screen sharing. - When a failure is detected: - Users will see an in-product message prompting them to retry sharing. - Where applicable, users will be prompted to update their macOS version.

- Updated documentation will outline common causes and remediation steps. - Updating to macOS Tahoe 26.4 or later resolves the issue. - As a mitigation, users can enable: - Teams Settings > General > Screen sharing >

Use Mac OS native sharing. - No restart is required after changing this setting. - This guidance experience is enabled by default; no admin configuration is required.

Further guidance includes the following: - Identify users running macOS versions earlier than macOS Tahoe 26.4. - Communicate this known issue and expected symptoms to users. - Recommend updating affected devices to macOS Tahoe 26.4 or later where possible. - Review device management policies to ensure updates can be applied.

- Update internal helpdesk documentation to include: - Symptoms of screen sharing failures. - macOS update as the primary resolution. - Alternative mitigation using Mac OS native sharing.

- Prepare support teams to assist users who require elevated privileges to update macOS. Suggested helpdesk message: If screen sharing in Teams on macOS shows a blank screen, stops unexpectedly, or fails to start, retry sharing and ensure the device is updated to macOS Tahoe 26.4 or later. You can also enable "Use Mac OS native sharing" in Teams under Settings > General > Screen sharing.

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