SNO IBMCloud ThinkSystem SR630: cluster's node didn't discover

[ebattat]

The following playbooks run properly:

$ ansible-playbook ansible/ibmcloud-create-inventory.yml
$ ansible-playbook -i ansible/inventory/ibmcloud.local ansible/ibmcloud-setup-bastion.yml
When running the following playbook:
$ ansible-playbook -i ansible/inventory/ibmcloud.local ansible/ibmcloud-sno-deploy.yml
Seems that cluster's node didn't discover, also verify it through assisted installer console: http://{BASTION_IP}:8080/clusters

What can be the reason that cluster's node didn't discover ?

Try to run on bastion the following cmd but it didnt help: $iptables -t nat -A POSTROUTING -o bond1 -j MASQUERADE

I have also checked that the virtual media is attached properly in the console and OCP image is loaded properly [see attached screenshot ]

What can be the reason that node undiscovered ?