I have a flexitask to which I have added a More Information outcome in addition to the standard Approve and Reject outcomes. I have set the Reject and More information outcomes to require comment, however I am able to complete the task without adding a comment.
I am using a custom task form, as well, so I decided to put a validation on the Comment to force the requirement with a form rule. But this also is allowing the task to be completed without entering a comment. Any suggestions? Screenshots attached.