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Looks like it's more of a configuration issue. Just having WINBIND entry in /etc/methods.cfg is not going to enable it. You need to set /etc/security/user SYSTEM attribute to use "compat or WINBIND".
If you are using KRB5 for that , then there is no need to use winbindd at all.
Can you try downgrading Samba to 4.14.4-2 version and see if things are working ?
if your where using default fallback mapping of users like: user = DOMAIN\user - then this is not possible in Samba 4.14.10 - see important note: SAMBA+ 4.15.2, 4.14.10 and 4.13.14 Security ReleasesWay around this is to manually define user mapping like this:/etc/samba/smb.conf:
[global]username map = /etc/samba/users.map
/etc/samba/users.map:user1 = DOMAIN\user1user1 = DOMAIN\user1