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I found it out by plugging in an external monitor and Night Shift not working with it. I could believe it is specific to the monitor you have, but judging by Apple support I'm not alone:

https://discussions.apple.com/thread/251249337

The answer implies that it only works on about four different monitors. I doubt that's true but it seems like a shot in the dark to know which it does and does not work with.

EDIT: just tried it again with Catalina. Nope.

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Interesting, never heard of that before! I use a 5 year old Dell P2715Q screen and I just enabled / disabled it and it's working fine so that list of screens seems to be outdated.

Works fine on a Dell and an Acer for me, never heard of that before as well.

I have a (probably) related issue on my dual display system where it works on one but not the other, making it just as useless in practice. I still use f.lux as a result.

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