Create a relationship connection between a Workfront project (or projects) to a single Slack Workspace Channel.
My experience has been that a Slack workspace is created for a dev team that is focused on a single project or sometimes a small number of projects.
With this connection in place the allow configuration of 'Push' notifications from Workfront to the Slack Workspace for changes like:
Task Creation - Notify Slack Workspace that a new task has been created for the connected project(s)
Task Assignment - Notify Slack Workspace that a task has been assigned. (bonus points if it only send the notification if the assignment is to a Workspace member)
Task Planned date change
Issue Creation/Assignment