64 bit python is building a 32 bit COM server

import platform 
platform.architecture() #('64bit', 'WindowsPE')

I'm running on 64 bit, specifically:
Python 3.8.8 (default, Apr 13 2021, 15:08:03) [MSC v.1916 64 bit
(AMD64)] :: Anaconda, Inc. on win32`

I created a COM server which I'd like to call from a 64 bit client:

class HelloWorld:
    # pythoncom.CreateGuid()
    _reg_clsid_ = "{E32B2663-BD8C-472A-AC96-142AE4665FD7}"
    _reg_desc_ = "MyLib COM server"
    _reg_progid_ = "MyLib.HelloWorld"

    _public_methods_ = ["Hello"]
    _public_attrs_ = ["softspace", "noCalls"]
    _readonly_attrs_ = ["noCalls"]

    def __init__(self):
        self.softspace = 1
        self.noCalls = 0

    def Hello(self, who):
        self.noCalls = self.noCalls + 1
        # insert "softspace" number of spaces
        return "Hello" + " " * self.softspace + str(who)

if __name__ == '__main__':
    import win32com.server.register
    win32com.server.register.UseCommandLine(HelloWorld)

Registered using: python server.py - (call the __main__ method to register the server)

From a 64 bit COM client (Excel VBA), I am unable to create an instance

Sub t()
    Dim a As Object
    Set a = CreateObject("MyLib.HelloWorld")
End Sub

I get

Module not found

I can in python 64 bit

from comtypes.client import CreateObject
c = CreateObject('MyLib.HelloWorld')

I can in a 32 bit VBA host.
I'm guessing my python server is being declared 32 bit, python comtypes just works^TM regardless of server bitness.