Go to Game Settings -> HUD and GAMEPLAY
UDP Telemetry Settings (bottom of the screen)
UDP Telemetry (DATA OUT) = On
IP 127.0.0.1
Port 10001
Install the Loop_back _utility
Select Forza Horizon 4 -> Save -> Quit utility
PS. UDP Port (default = 10001) can be configured in documents/simracingstudio/config.ini file
PS2. If you have another app using Forza UDP, it won't work since the other App is "blocking" the UDP for our app