Ansible troubleshooting - undefined variable

How to reproduce the `undefined variable` error in Ansible, troubleshooting, and fix to be able to successfully print the value of a variable on screen.

Timestamps
00:00 Introduction
00:35 debug reproducer playbook
01:53 error reproducer execution
02:54 troubleshooting and how to fix
03:48 fixed playbook execution
05:07 Recap

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