When performing an operation using the Active Roles Management Shell which is tied to an approval Workflow, the operation will fail with the following error message:
Your operation cannot be processed.
The operation you have requested requires approval by authorized persons, whereas the application you are using does not support the creation of approval requests. Use the ActiveRoles Server Web Interface to perform operations that require approval.
It is possible to trigger an approval via the Active Roles Management Shell, but custom checks have to be performed against the OperationStatus Control.
Enhancement request number 690364 has been submitted to Development for consideration in a future release of Active Roles