The following two programs were almost-copied from the examples in
Python 3.9.2 documentation on multiprocessing.managers.ShareableList.
I added an explicit address and authkey to both.

1.py starts the shared memory manager, allocates some shared memory,
and sleeps, leaving the manager running in a shell window.

2.py connects to the same shared memory manager and attempts to access
the same shared memory, via the names that were displayed by the
execution of 1.py (which I hardcoded into 2.py while 1.py was still running).
But a TypeError is raised for some obscure reason.

## 1.py below #######################################################
import time

from multiprocessing.managers import SharedMemoryManager
smm = SharedMemoryManager(
    ( '127.0.0.1', 23456),
    b'abc',
)
smm.start()
sl = smm.ShareableList(range(4))
print( 'sl', repr( sl))
another_sl = smm.ShareableList('alpha')
print( 'another_sl', repr( another_sl))
time.sleep( 600)
## 1.py above #######################################################

## 2.py below #######################################################
from multiprocessing.managers import SharedMemoryManager
smm = SharedMemoryManager(
    ( '127.0.0.1', 23456),
    b'abc',
)
smm.connect()
sl = smm.ShareableList( None, name = 'psm_25ffec92')  ## name typed in here from the run of 1.py
print( 'sl', repr( sl))
another_sl = smm.ShareableList( None, name = 'psm_e5f73dfa')
print( 'another_sl', repr( another_sl))
## 2.py above #######################################################

Here is the run of 1.py:

210402 11:48 /usr/local/ch-tools3/WORK root@guy{1}# python3 1.py
sl ShareableList([0, 1, 2, 3], name='psm_25ffec92')
another_sl ShareableList(['a', 'l', 'p', 'h', 'a'], name='psm_e5f73dfa')

And here is the run of 2.py:

210402 11:52 /usr/local/ch-tools3/WORK root@guy{1}#  python3 2.py
Traceback (most recent call last):
  File "/usr/local/ch-tools3/WORK/2.py", line 9, in <module>
    sl = smm.ShareableList( None, name='psm_25ffec92')
TypeError: ShareableList() got an unexpected keyword argument 'name'


210402 11:54 /usr/local/ch-tools3/WORK root@guy{1}# uname -a
Linux guy 5.10.0-4-amd64 #1 SMP Debian 5.10.19-1 (2021-03-02) x86_64 GNU/Linux

210402 12:21 /usr/local/ch-tools3/WORK root@guy{1}# python3 -V
Python 3.9.2