ManageIQ and Ansible: 'evm_owner_email' is undefined.

[flealf]

Hello.
I am using a Self-Service form to create a VM and then execute a playbook in Ansible (AAP 2.5).
Everything works fine, the VM is created without issues, and the job is launched. However, the playbook sends an email, and I am using the variable evm_owner_email, but it says it is undefined.

msg: >
  The task includes an option with an undefined variable. The error was:
  'evm_owner_email' is undefined. 'evm_owner_email' is undefined

How can I make the playbook recognize this variable?