Symptoms
K2 Studio Workflow using AD Security Groups to send the Approval too.
When user add or remove a user to the AD Group, this is not being reflected when the Approval is sent.
Diagnoses
Looking for a way to refresh the cache automatically to reflect users added to a group within the workflow.
Resolution
This is possible by using the API within a server event to refresh the cache.
You can build a small process that refreshes the cache and then call that workflow from a smartforms rule after a user was added to a group.