Can only get 2 of 3 displays to work in a 3-screen set-up

[SteveWashburn]

Running Windows 10, I am using my HP ProBook laptop with its HP dock, all monitors are connected to the doc. I am trying to set up 3 monitors extending the desktop to the 2nd and 3rd display. But the system will only recognize the 1st 2 of the 3. All cables are connected properly,

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