'How to add hosts to AWX?

I have a VirtualBox Desktop Ubuntu machine with AWX running. I then spun up a separate server Ubuntu machine in VirtualBox. To act as one of my hosts. I took the IP address of the server Ubuntu machine and inputted it as a host in AWX. After running a playbook I get the error "unreachable." I did create a credential according to this: https://docs.ansible.com/ansible-tower/latest/html/userguide/credentials.html#machine. And received the same error. I am looking use AWX to run playbooks on several on-prem Linux boxes/hosts. I am unsure how to configure AWS correctly credentials.



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