Calling SMJobBless with valid AuthorizationRef

I'm getting an error when calling SMJobBless - "ValueError: depythonifying
'pointer', got 'LP_c_void_p'". I've tried a few things without luck. Any
help will be appreciated.

Here's my code -

from ServiceManagement import (
    kSMDomainSystemLaunchd,
    SMJobBless,
)

security = ctypes.cdll.LoadLibrary(ctypes.util.find_library('Security'))

class AuthorizationItem(ctypes.Structure):
    _fields_ = [
        ('name', ctypes.c_char_p),
        ('valueLength', ctypes.c_uint32),
        ('value', ctypes.c_void_p),
        ('flags', ctypes.c_uint32),
    ]

class AuthorizationRights(ctypes.Structure):
    _fields_ = [
        ('count', ctypes.c_uint32),
        ('items', ctypes.POINTER(AuthorizationItem)),
    ]

authorization_item = AuthorizationItem(
    name='com.apple.ServiceManagement.blesshelper',
    valueLength=0,
    value=None,
    flags=0,
)
authorization_rights = AuthorizationRights(
    count=1,
    items=ctypes.pointer(authorization_item),
)
authorization_flags = 19
authorization_ref = ctypes.POINTER(ctypes.c_void_p)()
status = security.AuthorizationCreate(
    ctypes.pointer(authorization_rights),
    None,
    authorization_flags,
    ctypes.pointer(authorization_ref),
)
SMJobBless(
    kSMDomainSystemLaunchd,
    'app.helper',
    authorization_ref,
    None,
)

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