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Microsoft Windows 11

As described in the title. When I connect both cables to the monitor it fails to switch to the second one, which isn't the main one. 

Example setup:
I have a Displayport connected to my PC and an HDMI port to a reducer that goes to my Macbook. Both cables work perfectly separately, so it's not a problem. 

If I connect only one cable to the monitor through the reducer, it works. 

So obviously the monitor fails to switch between ports, even when it has that function. 

Any help please?

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