Hi Lars,
Looks like you need to start the play with “-” as the indent of 3 spaces to start is weird.
Take a look at github.com/ansible/ansible-examples for a few examples.
Also for future reference this is probably a topic for ansible-project (user and playbook questions) versus ansible-devel (topics related to development of new ansible code or plugins).
Let us know if you are still stuck after taking a look at examples and we should be able to get you sorted out.
Thanks!
–Michael