Hello Rodell,
Is there a way to assign workers to a created assignment using the Workforce App?
No, this is not possible.
I found this article explaining how Mobile Workers create Workforce Assignments using the Collector App: https://www.esri.com/arcgis-blog/products/workforce/field-mobility/workforce-and-collector-creating-.... The worker, however, cannot assign Mobile Workers to a created assignment.
That is correct, the article does not go into detail on how to assign work from the field through the Collector app. There are several pieces of information that need to be set when a work assignment is assigned to a Worker - which the Workforce web application are responsible for.
Using the Workforce App or a mobile web browser, can Dispatchers create Workforce assignments and assign them to Mobile Workers?
Through a mobile web browser, yes, if you sign in as Dispatcher, you can assign work from a mobile device.
Craig