Plant SCADA 2023 Deployment Client connection

I have been trying to configure a deployment server and client in Plant SCADA 2023 this week.

I have got to the point of the client connected to the system management service but continually get the following message every time I try to configure the client:

"Deployment client could not be registered with the System Management Servers Identity Manager.

Does anyone have some pointers on how to resolve this? I would expect that if the client can successfully connect to the System Management Server then it should not be a connection issue between the two machines.