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The bug has been reported on the MS Teams feedback forums, in case you guys want to upvote:

https://microsoftteams.uservoice.com/forums/908686-bug-reports/suggestions/40805257-screen-sharing-broken-on-linux-with-1-3-00-16851

@fxsti01 There's another workaround for that bug without having to downgrade. https://docs.microsoft.com/en-us/answers/questions/42095/sharing-screen-not-working-anymore-bug.html#answer-42165

Screensharing issue, black screen with red line around it, Microsoft bug. installed older version, 1.3.00.5153, works fine. Manually downloaded deb package, get sha256sum from that, edit build files, specify 1.3.00.5153 for version and sha256sum, installs and works fine. Set package to not check for updates.

@sgni19 I use the default screen resolution FullHD

@L0rne I tried that out. This also happens with a single window in front.

@LukasDoe Yes i have noticed the same issue. In my experience this only happens if you share a screen with overlapping windows. Sharing a screen with only one window seems to stop the flickering.

Screensharing issue - maybe this helps: https://answers.microsoft.com/en-us/msoffice/forum/all/microsoft-teams-black-screen-when-sharing-desktop/f148a94c-3373-4583-825c-aed0850d3bc8 Could be a screen resolution issue.

I have an issue with the client. If I make a screensharing session my screen is flickering for the other participants. Have someone else similar observations / expierences?

This may be for a super small amount of people, but disabling my Oculus Rift CV1 USB devices fixed my microphone. You can either just unplug it or copy the following rules into /etc/udev/rules.d/disable-usb-device.rules

ACTION=="add", ATTR{idVendor}=="2833", ATTR{idProduct}=="0211", RUN="/bin/sh -c 'echo 0 >/sys/\$devpath/authorized'"
ACTION=="add", ATTR{idVendor}=="2833", ATTR{idProduct}=="3031", RUN="/bin/sh -c 'echo 0 >/sys/\$devpath/authorized'"

thanks @louisnow. the workaround fix' it for me: mv /usr/share/teams/resources/app.asar.unpacked/node_modules/slimcore/bin/rect-overlay /usr/share/teams/resources/app.asar.unpacked/node_modules/slimcore/bin/rect-overlay-broken

For anyone suffering from the black screen with a red border when trying to screen share, Microsoft has acknowledged the problem and there's a temporary workaround.