Zoom virtuell background problem


i have the problem that when i use zoom and want to use a virtual background it doesn’t really work.

HD video is activated, virtual background is also switched on/activated in the settings.

The picture flickers so strangely and if I deactivate “green screen technology”, I have a still picture.

My PC is fast enough and new enough, AMD 3400G, 16GB DDR3, 512GB SSD…
I Tried the Version from “Software” and from the original Website “ubuntu version”.

There is a Fail, if i click from one virtuell background to the “none” : “this option is not available because your administrator requires a virtual background to start the video”

Thank you very much.

(Version 5.9.6 actually)