I am configuring simple buttons with keyboard bindings for MSFS2020. When three key bindings are assigned to a button, it seems only the last key binding is sent to the flight simulator.
Example: Decrease Mixture Shift + Ctrl + F2. These are default key bindings and work as expected when the keyboard is used.
However, after binding the three keys to a button and testing the throttle is decreased. The keyboard shortcut for this is F2.
Happy to help debug the issue if necessary.