Python getNamedConnection failing to retrieve connection by Name (str)

I’m trying to retrieve a WebConnection using the FMENamedConnectionManager in a PythonCreator as described here.

Content of the PythonCreator:

import fmeobjects
import fmewebservices

class FeatureCreator(object):  
    def __init__(self):
        fmewebservices.FMENamedConnectionManager.getNamedConnection('SAP S4')

    def input(self, feature: fmeobjects.FMEFeature):
        pass

    def close(self):
        pass

The execution fails with the Error
Python Exception <TypeError>: descriptor 'getNamedConnection' for 'fmewebservices.FMENamedConnectionManager' objects doesn't apply to a 'str' object

even though the documentation clearly states that the first parameter must be a string object (connectionName (str))

What am I doing wrong?