IPC service Sample with icmsg backend not working

[SherazJanjua2020]

I compile and flash both projects on following paths to respective cores of an nRF5340DK board: -

Application Core project: \v2.4.1\zephyr\samples\subsys\ipc\ipc_service\icmsg\

Network Core project: \v2.4.1\zephyr\samples\subsys\ipc\ipc_service\icmsg\remote\

When I connect to Serial Monitor I get following output: 

*** Booting Zephyr OS build v3.3.99-ncs1-1 ***
[00:00:00.277,862] <inf> host: IPC-service HOST demo started

I tried creating separate projects from samples still the same behavior.

I need to add the functionality into a project. But need to learn from samples first.

[SherazJanjua2020]

I enabled "use Sysbuild" option in Network Project configuration: Remote
It works alright.
However using sysbuild for CPU project fails build.