Windows 10: modification for night mode doesn't work on USB monitor

I have a 3rd monitor running from a USB port. Night mode doesn't switch this one. Is this a concern with USB or is the monitor too old (it's an old monitor)?

:)

 

Night Light Setting and Third Monitor.

Hi Reagan,

We would like to ask you some questions in order assist you properly:

• Did Night light work previously on all three monitors?
• Have you made any recent changes to your PC?
• Are you getting an error message on the third monitor regarding Night light?
• Is the third monitor being detected by your PC?
• What troubleshooting steps have you performed so far?

While waiting for your response, we suggest that you try to connect your third monitor to what you are using on the 2 working monitors to see if it is only a loose connection issue.

Regards.

 

3 monitor setups. Only 1 monitor fails to work for "Night Mode"

I have three monitors for my setup.
Asus VG278 (main)
Asus VG248
Asus VG245

I'm dual booting Windows 7 X64 and Windows 10 Pro X64 (Version 1909, OS Build 18363.592).
But the problem only applies to Windows 10.

I turn on the night mode on and night mode doesn't come on for the main monitor.
I found a way to solve this problem temporarily in a rather tedious manner but it's not a viable solution.

What I have to do to make it work is to change the monitor refresh rate and then all of sudden the night mode works.
This is very strange as I've never experienced this with Windows 7 by using Eyesaver app which has a similar effect as Night Mode on Windows 10.

So, I'm looking for a better way to fix this.

 

Night Mode

Thanks for your suggestions.