Same issue when resetting smb password using ‘smbpasswd -a dietpi’. What’s strange is root doesn’t even work 
root@:~# journalctl -u nmbd -u smbd
-- Logs begin at XXX 2019-02-XX XX:XX:XX XXXX, end at XXX 2022-10-XX XX:XX:XX XXX. --
Oct XX XX:XX:XX XXXXXXXX systemd[1]: /lib/systemd/system/nmbd.service:9: PIDFile= references path below legacy directory /var/run/, updating /var/run/samba/nmbd.pid → /run/samba/nmbd.pid; please update the unit file accordingly.
Oct XX XX:XX:XX XXXXXXXX systemd[1]: Starting Samba NMB Daemon...
Oct XX XX:XX:XX XXXXXXXX systemd[1]: Started Samba NMB Daemon.
Oct XX XX:XX:XX XXXXXXXX systemd[1]: /lib/systemd/system/smbd.service:9: PIDFile= references path below legacy directory /var/run/, updating /var/run/samba/smbd.pid → /run/samba/smbd.pid; please update the unit file accordingly.
Oct XX XX:XX:XX XXXXXXXX systemd[1]: Starting Samba SMB Daemon...
Oct XX XX:XX:XX XXXXXXXX systemd[1]: Started Samba SMB Daemon.
Oct XX XX:XX:XX XXXXXXXX smbd[4801]: pam_unix(samba:session): session opened for user dietpi by (uid=0)
Oct XX XX:XX:XX XXXXXXXX smbd[4801]: pam_unix(samba:session): session closed for user dietpi
Oct XX XX:XX:XX XXXXXXXX smbd[6991]: pam_unix(samba:session): session opened for user dietpi by (uid=0)
Oct XX XX:XX:XX XXXXXXXX smbd[6991]: pam_unix(samba:session): session closed for user dietpi
root@:~# ***systemctl status nmbd smbd***
● nmbd.service - Samba NMB Daemon
Loaded: loaded (/lib/systemd/system/nmbd.service; disabled; vendor preset: enabled)
Active: active (running) since XXX 2022-10-XX XXX:XX:XX XXXX; XXX
Docs: man:nmbd(8)
man:samba(7)
man:smb.conf(5)
Main PID: 582 (nmbd)
Status: "nmbd: ready to serve connections..."
Tasks: 1 (limit: 4915)
CGroup: /system.slice/nmbd.service
└─582 /usr/sbin/nmbd --foreground --no-process-group
Oct XX XX:XX:XX XXXXXXXX systemd[1]: Starting Samba NMB Daemon...
Oct XX XX:XX:XX XXXXXXXX systemd[1]: Started Samba NMB Daemon.
● smbd.service - Samba SMB Daemon
Loaded: loaded (/lib/systemd/system/smbd.service; disabled; vendor preset: enabled)
Active: active (running) since XXX 2022-10-XX XX:XX:XX XXXX; XXX
Docs: man:smbd(8)
man:samba(7)
man:smb.conf(5)
Process: 606 ExecStartPre=/usr/share/samba/update-apparmor-samba-profile (code=exited, status=0/SUCCESS)
Main PID: 607 (smbd)
Status: "smbd: ready to serve connections..."
Tasks: 3 (limit: 4915)
CGroup: /system.slice/smbd.service
├─607 /usr/sbin/smbd --foreground --no-process-group
├─610 /usr/sbin/smbd --foreground --no-process-group
└─611 /usr/sbin/smbd --foreground --no-process-group
Oct XX XX:XX:XX XXXXXXXX systemd[1]: Starting Samba SMB Daemon...
Oct XX XX:XX:XX XXXXXXXX systemd[1]: Started Samba SMB Daemon.
Oct XX XX:XX:XX XXXXXXXX smbd[4801]: pam_unix(samba:session): session opened for user dietpi by (uid=0)
Oct XX XX:XX:XX XXXXXXXX smbd[4801]: pam_unix(samba:session): session closed for user dietpi
Oct XX XX:XX:XX XXXXXXXX smbd[6991]: pam_unix(samba:session): session opened for user dietpi by (uid=0)
Oct XX XX:XX:XX XXXXXXXX smbd[6991]: pam_unix(samba:session): session closed for user dietpi
root@:~# ***ss -tulpn | grep LISTEN***
tcp LISTEN 0 128 0.0.0.0:8081 0.0.0.0:* users:(("python",pid=275,fd=4))
tcp LISTEN 0 256 0.0.0.0:53 0.0.0.0:* users:(("unbound",pid=563,fd=4))
tcp LISTEN 0 128 0.0.0.0:22 0.0.0.0:* users:(("sshd",pid=553,fd=3))
tcp LISTEN 0 5 0.0.0.0:8888 0.0.0.0:* users:(("rpimonitord",pid=1372,fd=5))
tcp LISTEN 0 4096 127.0.0.1:8125 0.0.0.0:* users:(("netdata",pid=909,fd=11))
tcp LISTEN 0 50 0.0.0.0:445 0.0.0.0:* users:(("smbd",pid=607,fd=31))
tcp LISTEN 0 4096 0.0.0.0:19999 0.0.0.0:* users:(("netdata",pid=909,fd=3))
tcp LISTEN 0 128 0.0.0.0:8421 0.0.0.0:* users:(("pisugar-server",pid=269,fd=13))
tcp LISTEN 0 1024 0.0.0.0:8422 0.0.0.0:* users:(("pisugar-server",pid=269,fd=11))
tcp LISTEN 0 1024 0.0.0.0:8423 0.0.0.0:* users:(("pisugar-server",pid=269,fd=10))
tcp LISTEN 0 4096 0.0.0.0:5001 0.0.0.0:* users:(("iperf",pid=1606,fd=3))
tcp LISTEN 0 80 127.0.0.1:3306 0.0.0.0:* users:(("mysqld",pid=671,fd=23))
tcp LISTEN 0 50 0.0.0.0:139 0.0.0.0:* users:(("smbd",pid=607,fd=32))
tcp LISTEN 0 128 0.0.0.0:10000 0.0.0.0:* users:(("miniserv.pl",pid=1593,fd=5))
tcp LISTEN 0 511 0.0.0.0:80 0.0.0.0:* users:(("nginx",pid=780,fd=5),("nginx",pid=779,fd=5),("nginx",pid=778,fd=5),("nginx",pid=777,fd=5),("nginx",pid=776,fd=5))
tcp LISTEN 0 4096 *:5201 *:* users:(("iperf3",pid=1604,fd=3))
tcp LISTEN 0 128 [::]:22 [::]:* users:(("sshd",pid=553,fd=4))
tcp LISTEN 0 2 [::ffff:127.0.0.1]:3350 *:* users:(("xrdp-sesman",pid=537,fd=7))
tcp LISTEN 0 2 *:3389 *:* users:(("xrdp",pid=554,fd=11))
tcp LISTEN 0 50 [::]:445 [::]:* users:(("smbd",pid=607,fd=29))
tcp LISTEN 0 50 [::]:139 [::]:* users:(("smbd",pid=607,fd=30))
tcp LISTEN 0 511 [::]:80 [::]:* users:(("nginx",pid=780,fd=6),("nginx",pid=779,fd=6),("nginx",pid=778,fd=6),("nginx",pid=777,fd=6),("nginx",pid=776,fd=6))