Data monitor through Etherne Switch(TP-link 5 port switch)

I’m very new to “wireshark”.Im working on embedded project and it works as Server to client configuration through TCP/IP peer to peer. We faced some issue related to the data synchronization while running external application. so we decided to connect Server and client through switch (TP-link 5 port switch) and introduce another PC2 to monitor the data communication between Server and client using “Wireshark” application running in PC2.

Here the issue is not able to tap/read the data send by client and server.

Request someone to help on this issue.