Unable to add a dbus user session as a service to raspberry Pi zero 2 W image

I've been trying to add pulseaudio as a service to my raspberry Pi image (core-image-minimal) for a few days now. As pulseaudio apparently requires to be added as a d-bus user session only, I then tried to start a user session in systemd. No Joy!

I have dbus running as a service but it is a system level service and not a user level service:

root@raspberrypi0-64-wf:~# systemctl status dbus.service
● dbus.service - D-Bus System Message Bus
Loaded: loaded (/usr/lib/systemd/system/dbus.service; static)
Active: active (running) since Tue 2025-02-25 21:28:52 UTC; 2min 40s ago
Invocation: 95ded9e8656b41abb16c48c6e1ace29c
TriggeredBy: ● dbus.socket
Docs: man:dbus-daemon(1)
Main PID: 217 (dbus-daemon)
Tasks: 1 (limit: 249)
CPU: 222ms
CGroup: /system.slice/dbus.service
└─217 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only

When I try to start a user session:

> 
> root@raspberrypi0-64-wf:~# systemctl --user enable dbus.service
> Failed to connect to user scope bus via local transport:
> $DBUS_SESSION_BUS_ADDRESS and $XDG_RUNTIME_DIR not defined (consider using
> --machine=<user>@.host --user to connect to bus of other user)
> 

I've not managed to find any examples of d-bus running as a user session.

Is there some secret sauce that I'm missing?

I did try to run pulseaudio as a system service, it was a blood bath (I refer to the amount of red error messages)

Cheers!!