Recently I bought xerox b215 (if you can, buy something other than xerox or hp) and wanted to make it scan to smb share. I already had configured samba in container using servercontainers/samba image.
So, it’s just to add another new share and configure user for scanner, right? Wrong!
It’ just didn’t worked. Thanks xerox’s engineers who decided not to burden end-user with diagnostic messages. It started scanning and after a second  returned back to the scan screen. Samba with log level 10 didn’t help me too, I just saw that client tried to connect and that all.
The tool which helped me is wireshark, I’ve found that after NTLMSSP_AUTH request from scanner samba sends STATUS_LOGON_FAILURE.

A little bit of “letsgoogleit” and voila ntlm auth = ntlmv1-permitted allowed me not to configure FTP for that lovely xerox.