Project Cars 3
Currently the UDP Telemetry Feature of Project Cars 3 is NOT(!) unlocked on Consoles.
There is no information, if the game developer adds that feature with a later update of the game, or if gets a PC exclusive feature.
If you are playing on the PC I advise to use the Shared Memory Interface, which runs with less configuration.
Open the options
To enable UDP Telemetry in Project Cars 3, open the options of the game (from the mainscreen, NOT from the Pause Menu).
Enable UDP Telemetry
Then select the "System" Tab (scroll to the right).
Select a UDP-Frequency (1 is the fastest setting), e.g. select 4. If you experience connection problems or delays you can increase the UDP frequency to a higher value, to reduce the data transmission and improve performance.
Then select the entry "Project CARS 2" or "Project CARS 1" for the UDP Protocolversion option. The app supports both protocol versions.
If you still get no data after configuring everything according to the instructions above, you should try to switch the connection method of your Playstation/Xbox. If you are currently using a LAN Cable to connect the Console, try to connect it via WiFi or vice versa. Sometimes the game sends the data on the wrong interface.