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Windows requires a physical mouse to be plugged in to your target computer to show the mouse pointer.
Reemo requires the installation of the Windows ViGEm driver (https://github.com/ViGEm/ViGEmBus/releases) on your remote computer.
Reemo 126.96.36.199 or higher is required in order to ensure compatibility with the Virtual Gamepad Emulation Bus driver.
After the driver is installed, start a new Reemo session, push a button or two on your controller, it should appear on your remote Computer. You can test that everything is working by visiting https://gamepad-tester.com
Reemo requires at least one monitor to be plugged in to capture your desktop. If you do not wish to have monitors or want to add more monitors to your Reemo enabled computer, you can buy some cheap HMDI or Display Port dongles that mimicks a monitor and plug them to your GPU.
If you are sure that your computer is on and connected to internet, please check that the Windows Service "Reemo" is up and running and that your Private Key is correct.
Please check that the Windows Service "Reemo Auto Updater" is up and running.