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Question

Hi all

One of our users is unable to share their screen during Microsoft Teams meetings with external users.

I have already verified that there are no Teams meeting policies or sharing policies blocking screen sharing for the user. User is assigned E5 license. please guide me how to fix the issue.

Answer 1

Dear @Glenn Maxwell,

Thank you for bringing this issue. I understand that you are experiencing difficulty sharing your screen during Microsoft Teams meetings when external participants are involved. I sincerely apologize for the inconvenience this may be causing and appreciate your patience.

Based on the information provided, your Teams policies and licensing appear to be correctly configured. To help isolate and resolve the issue, I kindly ask you to perform the following checks:

1.Confirm Meeting Options

Even if policies are correctly configured at the admin level, meeting-level settings can override sharing permissions.

• Open the meeting > Meeting options
• Ensure “Who can present” is set to: Everyone, or People in my organization and guests

2.Meeting policy/content-sharing settings

• In the Teams Admin Center go to Meetings > Meeting policies > select the policy you’ve assigned > Content sharing.
• Make sure “Screen sharing mode” is set to Single application and desktop not “Disabled”.
• Confirm that policy is applied to the affected user (you can force a policy sync by having them sign out of Teams completely and sign back in).

3.Client-side health

• Ask the user to update to the latest Teams desktop client
• Completely quit Teams, clear the cache (%appdata%\Microsoft\Teams\Cache), then restart. Clear the Teams client cache - Microsoft Teams | Microsoft Learn 

Try sharing in the Teams web client (Edge/Chrome) to see if it’s desktop-client specific.

4.Network/media path

• Screen sharing is essentially a media stream. Packet loss or blocked UDP ports can kill that stream and surface as a generic error.
• Have the user make a test call (search for “Call Health” in Teams or use the Teams test call bot) and check for high jitter/loss.
• If they’re behind a corporate firewall or VPN, ensure UDP ports 3478–3481 and 50000–50059 are open/whitelisted.

5.Test on a Different Network or Device

If possible, please test from another device or network. If it works elsewhere, the issue may be related to local network/firewall configuration.

6.Reinstall Teams: Try completely uninstalling and reinstalling it. 

• Uninstall first: Uninstall Microsoft Teams - Microsoft Support 
• Then reinstall: Download Microsoft Teams Desktop and Mobile Apps | Microsoft Teams 

For more reference:

• Manage meeting policies for content sharing
• Teams settings and policies reference

If the issue continues after the above steps, I kindly request the following details to assist further investigation:

1. Could you please confirm if this issue is affecting only one user within your organization?
2. Is the affected user an internal user within your tenant, or an external participant?
3. Could you kindly provide the current Microsoft Teams version that the affected user is using?
4. Does the issue occur when the user is using the Microsoft Teams desktop application, the web version or both?

Note: Please understand that our initial response may not always resolve the issue immediately. However, with your help and more detailed information, we can work together to find a solution.

Please feel free to reply below if you have any update or further concern.  

Thank you for your patience and understanding. I appreciate your continued trust. Hope you having a nice day and really much warm regards to you as well! 

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