Unable to connect via jump-server. Do not understand why control socket is missing

According to the docs setting ProxyCommand in ansible_ssh_command_args will enable access to private servers via a jump server.

I am attempting to do this but keeping the error Control socket “/Users/pnotes/.ansible/cp/cfed83541a” does not exist.

My current setup is thus:

ansible/test/inventory.ini
`
[all]
bastion-0
private-server0

[bastions]
bastion-0 ansible_host=104.xxx.xx.xxx

[private_servers]
private-server0 ansible_host=68.xxx.xxx.xxx

`

ansible/test/host_vars/private-server0.yaml
`

Long shot… did you ever figure out what the issue was?