I don't know how to find what went wrong though, logs don't seem to be available in either:
https://hue.wikimedia.org/oozie/list_oozie_workflow/0026548-170621131133576-oozie-oozi-W/
or:
https://yarn.wikimedia.org/cluster
UPDATE: Nuria thinks it's because of the new fields, and that makes perfect sense. Assigning to her.