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We're experiencing a similar problem with NVIDIA Quadro P2200 using the latest Nvidia driver versions (441.28 and 441.66) on several Windows 10 (build 10.0.18363) systems (ie, all that we have this card installed in).

In our case, screenconnect (19.4.25666.7235) does work, but only when a monitor is connected to the Quadro card. If the system is running headless, screenconnect remains blank (gray).