Getting this?

   pid_to_procid: messaging_dgm_get_unique failed: No such file or directory
  Failed to fetch domain sid for XYZ
  Failed to check for local Administrators membership (NT_STATUS_INVALID_PARAMETER_MIX)
  Failed to check for local Guests membership (NT_STATUS_INVALID_PARAMETER_MIX)
  create_local_token failed: NT_STATUS_NO_MEMORY
  ERROR: failed to setup guest info.
 

while having samba leverage SSSD?

[global]
        realm = MDS.XYZ
        workgroup = XYZ
        security = ads
        kerberos method = secrets and keytab
        template homedir = /n/%d/%u
        idmap config * : backend = tdb
        idmap config * : range = 10000-199999
        idmap config MDS : backend = sss
        idmap config MDS : range = 200000-2147483647
        passdb backend = tdbsam

        load printers = yes
        printing = cups
        printcap name = cups
        cups options = raw
        log level = 4
        max protocol = SMB3
        min protocol = NT1
        local master = no
        disable spoolss = yes

Then you need to run:

# yum install sssd-libwbclient

Cheers,
TK