Routing YAML Access Denied

Hello everyone,

I created the Hello world example module for Drupal 8 -> https://www.drupal.org/node/2464207.
When accessing /hello page, I get an Access denied screen. If I remove _permissions: ‘access content’ and add _access: ‘TRUE’, the /hello page runs correctly.

Am I missing something here?

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/4/feed