Windows Defender and Microsoft Teams

js011 1

JimmyYang-MSFT 50,446 Reputation points Microsoft Vendor

2021-07-13T05:28:38.367+00:00

Hi @js011

Does this phenomenon only happened in Microsoft Teams? What about other office applications?

Based on my research, if you don't want to see these notifications, you could go to Control Panel > System and Security > Windows Defender Firewall > Allow an app or feature through Windows Defender Firewall. Click "change settings" and try to allowed Teams application in Allowed apps. For more details, you could refer to:

https://www.howtogeek.com/435610/why-does-windows-defender-firewall-block-some-app-features/

In addition, please check if there is any GPO settings that cause you always received this notification.

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js011 1 Reputation point

2021-07-14T15:38:26.887+00:00

Thanks for the note. I already tried that. It didn't help.
If I close the alert, it still lets me use Teams. If I end the Teams task and launch it again, it gives the alert again.

It looks like it doesn't like %username%, %localAppData%, or %userprofile%. If I type the actual username, it doesn't give me the alert.
JimmyYang-MSFT 50,446 Reputation points Microsoft Vendor

2021-07-16T09:01:19.18+00:00
@js011

Do you have any operations before this problem occurred?

You could try to reset Windows Security Centre service to see if works. Here are the steps for your reference:

Press Windows key + R. In the Run dialog box, type services.msc, and hit Enter to open Services.

Find the Security Center service.

Right-click the Security Center service, and go to Reset.

Restart your computer.
js012 1 Reputation point

2021-07-16T22:41:38.403+00:00

I tried that. Didn't help. I think I found the issue. If I remove the variable and entered the actual username, it doesn't alert me anymore. But I don't want to enter all the current and future usernames on the computer. I would like to use a variable (%localappdata%, %userprofile%) or similar as I want to make sure it covers any user who logs in to the computer. Or I might just install Teams machine-wide which also changes the installation path.
JimmyYang-MSFT 50,446 Reputation points Microsoft Vendor

2021-07-26T01:57:28.517+00:00

Hi @js012

If you want to broad deployment, you could try to use Microsoft Endpoint Configuration Manager, or Group Policy, or any third-party distribution mechanisms to complete it. For more details, you could refer to this article

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Windows Defender and Microsoft Teams