samba - Apr 2022 - In Samba logs, I get " check_account: Failed to convert" or "check_account: Failed to find local account" error messages.

Hi - On an older Ubuntu 18 computer, I tried to configure Samba, whose 
latest version available for Ubuntu 18 is Samba 4.7.6.   I successfully 
joined to our windows domain, according to all commands that I've run, 
including wbinfo.   I am running SSSD for domain login access, which 
works fine.  But when I try to connect from a Windows 10 computer to the 
Samba server, it says user and password is correct, and prompts for 
username and password again.   It still says that it is incorrect.   The 
samba log for that node, initially showed me this error:

[2022/04/18 01:28:38.164874,  0] 
../source3/auth/auth_util.c:1259(check_account)
   check_account: Failed to convert SID 
S-1-5-21-1078081533-1580818891-1957994488-2127 to\
  a UID (dom_user[PSFC\mrl])

I couldn't find any any solution on the web that useful.     Then 
something I did, caused the error message to change to this:

[2022/04/18 02:05:39.810294,  0] 
../source3/auth/auth_util.c:1267(check_account)
   check_account: Failed to find local account with UID 3000 for SID 
S-1-5-21-1078081533-\
1580818891-1957994488-2127 (dom_user[PSFC\mrl])

I don't have a solution to this error either.  I don't know what to try 
next.   Any recommendations (besides upgrading to Ubuntu 20)? Thanks. - 
Mark

On Mon, 2022-04-18 at 03:25 -0400, Mark London via samba
wrote:
> Hi - On an older Ubuntu 18 computer, I tried to configure Samba,
> whose 
> latest version available for Ubuntu 18 is Samba 4.7.6.   I
> successfully 
> joined to our windows domain, according to all commands that I've
> run, 
> including wbinfo.   I am running SSSD for domain login access, which 
> works fine.
Sorry, but Samba cannot provide support for sssd, because Samba does
not produce it.
>   But when I try to connect from a Windows 10 computer to the 
> Samba server, it says user and password is correct, and prompts for 
> username and password again.   It still says that it is
> incorrect.   The 
> samba log for that node, initially showed me this error:
> 
> [2022/04/18 01:28:38.164874,  0] 
> ../source3/auth/auth_util.c:1259(check_account)
>    check_account: Failed to convert SID 
> S-1-5-21-1078081533-1580818891-1957994488-2127 to\
>   a UID (dom_user[PSFC\mrl])
> 
> I couldn't find any any solution on the web that useful.     Then 
> something I did, caused the error message to change to this:
What did you do ???
> 
> [2022/04/18 02:05:39.810294,  0] 
> ../source3/auth/auth_util.c:1267(check_account)
>    check_account: Failed to find local account with UID 3000 for SID 
> S-1-5-21-1078081533-\
> 1580818891-1957994488-2127 (dom_user[PSFC\mrl])
> 
> I don't have a solution to this error either.  I don't know what to
> try 
You have provided us with very little to work with, so can you post the
output of 'testparm -s'

Have you a reason for not updating to 20.04 ? That would get you Samba
4.13.x and 4.7.6 is ancient in Samba terms.

Rowland