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Did you copy the user in Active Directory or just copy their user profile folder on the local drive?<br><br><br>
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It was copied from within Active Directory.
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If you create a new user, does it do the same thing?
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I accessed AD on their server.<ul><li>There is a user account that displays 2 monitors properly on this machine. Call it UserA&nbsp;</li><li>Renamed the account that had been created by copying UserA and then disabled it. Call it UserB.</li><li>Created a new account using the same name as originally used for UserB. Call it UserC.</li><li>Accessed the workstation and rebooted it.&nbsp;</li><li>Logged in using the new user profile UserC and the result was the same.&nbsp;</li><li>I can toggle back and forth between the new account UserC and UserA . UserC displays only a single monitor while UserA displays 2 monitors on the same machine.</li></ul>
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Turned out that a video adapter was causing this issue. Changed the adapter and now both users can see 2 monitors. Never expected the issue to be a hardware issue since it seemed directly affected by the user profiles and nothing else.
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That is really strange, but at least you got it worked out.
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Created a new domain user by copying an existing administrator profile. Logged in on a workstation being used by the original administrator account. Windows 10 easily detects and configures 2 monitors. Switch user profile to the new profile that was copied and it will only detect a single monitor - this is on the same workstation. When you toggle between the 2 users the original administrator profile sees 2 monitors and the copied profile sees only 1 and will not detect a 2nd monitor at all. This is a Server 2012 Essentials environment and domain.
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Created a new domain user by copying an existing administrator profile. Logged in on a workstation being used by the original administrator account. Windows 10 easily detects and configures 2 monitors. Switch user profile to the new profile that was copied and it will only detect a single monitor - this is on the same workstation. When you toggle between the 2 users the original administrator profile sees 2 monitors and the copied profile sees only 1 and will not detect a 2nd monitor at all. This is a Server 2012 Essentials environment and domain.

Specific user profile can't detect 2nd monitor in Windows 10

Windows 10 is a personal computer operating system featuring the "universal application architecture" (UAP); apps can be designed to run across multiple devices with nearly identical code, including PCs, tablets, smartphones, embedded systems, Xbox One, Surface Hub and HoloLens. Windows 10 also includes a virtual desktop system, a window and desktop management feature called Task View, the Microsoft Edge web browser, support for fingerprint and face recognition login, voice-based search (Cortana), new security features for enterprise environments, and DirectX 12 and WDDM 2.0 to improve the operating system's graphics capabilities for games.

Windows 10

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

A monitor or a display is an electronic visual display for computers, usually comprised of the display device, circuitry, casing, and power supply. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD) thin panel, while older monitors used a cathode ray tube (CRT) about as deep as the screen size. They are connected to the computer via VGA, DVI, DisplayPort, Thunderbolt, LVDS or other proprietary connectors and signals.