https://bugzilla.redhat.com/show_bug.cgi?id=2078243
Sumit Bose sbose@redhat.com changed:
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--- Comment #5 from Sumit Bose sbose@redhat.com --- Hi,
this is expected behavior since Fedora 35. If there is no explicit configuration SSSD is not started anymore. Before SSSD started even if there was not configuration file and handled looks for users and groups from /etc/passwd and /etc/group, respectively. It turned out that the benefits of this were less than hoped and it was disabled in Fedora 35 by change https://fedoraproject.org/wiki/Changes/FlexibleLocalUserCache.
HTH
bye, Sumit