Authorization workflow step being ignored by tasks generated by MATE step.

Hi Folks,
I have a configuration where a parent workflow MATE step splits a multi-lingual XML then the child tasks go through a separate workflow. Both child and parent workflows have an 'Authorization' step but the child tasks simply bypass the 'Authorization' step in the workflow. This seems to be interfering with the ability to approve the jobs in LanguageCloud.

When I attempt to modify step in the child tasks, the 'Authorization' workflow step does not appear in the list of available steps. Looking at the task histories, there is not even any mention of arriving at or leaving the 'Authorization' step either.

Has anyone faced this before?
Liam.