Embedded python method is erroring with <OBJECT DISPATCH>

Hi, I am trying to use embedded python in a cache class, but I can only get it to work in the source code namespace.

We map our client namespaces to our source code namespaces using Default Database for Routines under System > Configuration > Namespaces > Edit Namespace in the management portal.

In the source code namespace:

SOURCENEW>w ##class(EF.helloWorld).helloWorldPython()

Hello World!

SOURCENEW>ZN "EVEXAMPLE"

In the client namespace:

EVEXAMPLE>w ##class(EF.helloWorld).helloWorldPython()

W ##CLASS(EF.helloWorld).helloWorldPython()

^

<OBJECT DISPATCH> *python object not found

What do we need to do to get this working?