samba - Jul 2023 - Sonos S1 access denied with Samba 4.17

I just upgraded from Debian 11 to Debian 12 and now (I think as a
result) my Sonos S1 units cannot play music from my SMB share.

The (updated) version of Samba is 4.17.9, while the version which I
believe previously worked was 4.13.13.

On the Sonos controller (i.e. my phone) I see the error message
"Unable to play '<album name>'  access to ////nas/music
denied."

I've captured (see link below) the log file for the affected client
covering just the relevant time period, though I don't know which bit
of the log file would really be illuminating.

If I run (on a local Linux machine)

    smbclient  \\\\\\\\nas\\\\music -N  -U guest -c  'dir james/\*.\*'

Then I get pretty much the output I would expect.  I suppose that the
protocol version being used by smbclient doesn't match that of the
Sonos S1 units, though.

More details:
   * Samba log file: https://pastebin.com/WJaMnpyi
   * smb.conf: https://pastebin.com/BzqyeNrh
>From the Debian changelog I see this, which could be relevant, though
I don't know how relevant it is.

    898   * Notable changes in 4.16 series compared to 4.13:
[...]
    904     - SMB1 protocol has been deprecated, some subcommands has
been removed

How can I get this working?   Read-only access is fine.

Thanks for any help.

I set

   server min protocol = NT1
   client min protocol = NT1

in smb.conf.    Then restarting smbd (and likewise for all subsequent
changes).  This did not seem to solve the problem.   At this point I
switched from testing by asking the Sonos unit to play a track from
the share, to re-entering the details of the SMB share where the music
files lived.  That didn't work.  I added an SMB user named
"sonos".
That didn't seem to fix the problem.   I added a local OS user also
named "sonos".  That also didn't seem to fix the problem (though
in
all these cases it worked from smbclient).

I then changed smb.conf to set

   unix extensions = no

Following that, the Sonos S1 system was able to connect,   I don't
know for sure if this was the important change, or whether things
lurched to life following some earlier change with delayed effect.

James.