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Works fine in current KDE master branch, and it's been working for quite a while so it should be in the current release. Note that I run Teams in MS Edge for Linux, which is my dedicated Teams runtime environment and sandbox.

The only time I've ever had screensharing working correctly is under Wayland

I use it via Chromium. Are there additional features in the Electron version?

There is no electron version of MS Teams on Linux (any more). Thanks Microsoft!