Clustering Issue

Hi,

I have just installed Redhat Datagrid 8.4 on a Virtual Server on IBM cloud. Using the documentation as per the link (https://access.redhat.com/documentation/en-us/red_hat_data_grid/8.0/html/data_grid_server_guide/start_server.), I have created a main folder redhat data grid. Within it, I have 2 folder server folders; server and server1.
My initial test was to leave everything by default and start two instances of data grid as follows and see if they discover each other:
bin/server.sh
bin/server.sh -o 100 -s server1

However they are not being able to discover each other. Is there any configuration that needs to be done in the default configuration?
Based on the documentation, I should only unzip the server file and then run the command above to have the servers discover each other.

Grateful if someone could help me on this.

Kind Regards
Aswin