Sorry, maybe I expressed myself badly or the example I gave you is not in line with what I would like to do.
I would like to have the microservice that manages only the workflows and the various microservices that have the implementation of the activities to be called from the workflow microservice. The prj I sent you was just a test to figure out how to call an untype activity from a workflow, without register or in the workflow, if possible. Maybe not the correct example, but I needed it for the creation of a poc