Unavle to open in 5.4 project with VcamInputSubsystem

Hello,
I have a project using VCamInputSubsystem to recover the status of a joystick that works in 5.3.2.
When opening it in 5.4, I get Plugin ‘Mulitiuser Client’ failed to load (cannot be loaded).
The same way, a simple tutorial such as ‘Virtual Camera Component Quick Start’, cannot be followed because ‘Get VcamInputSubsystem’ seems unavailble in a 5.4 project.
Does any body had the same problem?