[Samba] W10 Pro 1903 and Samba with Roaming Profiles: "We can't sign in to your account"

[Oliver Doll]

[see also my thread started here
https://social.technet.microsoft.com/Forums/en-US/b653e756-f966-4f8f-9d13-f19a88d4cc5e/w10-pro-1903-and-samba-with-roaming-profiles-quotwe-cant-sign-in-to-your-accountquot?forum=win10itprogeneral]

Hello,

since the upgrade from W10 pro 1809 to 1903 roaming users can still
logon, but they are 'greeted' with the message: "We can't sign in to
your account", letting them know, that they are working with a temporary
user profile only, and that their work will get lost, if they don't
sign-off.

The user profiles are handled by a samba server running in an NT4-Style
DC Mode with "Single Label DNS Domain" on a Debian system.

When the user's logged on to the 1903 machine with the temp profile, his
home directory on the samba server is mapped (as usually) locally on to
the network drive with the letter Z: [e.g. shown as "zurbel (\\share)
(Z:)"] and he also has access to all other shares and it's data on the
samba server.

I had a look into the registry for ".bak" profiles, but there aren't
any. so I think this is not the problem.

As a test I created the new and clean empty user profile "zurbel" on the
samba, however also this new user gets the same warning.

The login with this user on to a 1809 system works flawlessly.

A profile.V6 gets created and also the user's data get properly synced
(back) to its directory on the samba server.

zurbel# ls -al profile.V6/
total 836
drwxr-xr-x 16 zurbel root    4096 Jun  4 19:27 .
drwxr-xr-x  3 zurbel root    4096 Jun  4 19:12 ..
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 3D Objects
drwxrwxr-x  3 zurbel guest   4096 Jun  4 19:24 AppData
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 Contacts
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 Desktop
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 Documents
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 Downloads
drwxrwxr-x  3 zurbel guest   4096 Jun  4 19:24 Favorites
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 IntelGraphicsProfiles
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 Links
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 Music
-rwxrwxr-x  1 zurbel guest 786432 Jun  4 19:27 NTUSER.DAT
-rwxrwxr-x  1 zurbel guest    294 Jun  4 19:27 ntuser.ini
drwxrwxr-x  4 zurbel guest   4096 Jun  4 19:24 Pictures
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 Saved Games
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 Searches
drwxrwxr-x  2 zurbel guest   4096 Jun  4 19:24 Videos

Does anybody have a hint how to fix this issue, pls.
-- 
Thx & cheers
Oliver

PS: In the meantime in the hope to make this issue obsolete I made three
attemps to "Classic Upgrade" my NT4 Style Domain, but without success,
which is another story though ...