Formerly working ansible playbook now quietly does nothing - how to debug ?

Hi List

I’ve previously run a playbook to deploy an ec2 instance to aws, which worked fine.
Except now, having made no changes to the playbook, it does nothing.
There are no apparent errors or messages to indicate what it’s actually doing.

Any clues on how to dig further as to why it’s not deploying an instance now?

Here is the output of a run:

bash-3.2$ ansible-playbook -vv splunk-indexer-ubuntu.yml

Using /Users/moi/Ansible/ansible.cfg as config file

PLAYBOOK: splunk-indexer-ubuntu.yml ********************************************

1 plays in splunk-indexer-ubuntu.yml

PLAY RECAP *********************************************************************

Here is the full playbook: