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sssd-kcm should follow Heimdal's return codes. Heimdal returns `KRB5_FCC_INTERNAL` for cases where operation code is not known or not implemented. See:

* https://github.com/heimdal/heimdal/blob/master/kcm/protocol.c#L1785
* https://github.com/heimdal/heimdal/blob/master/kcm/protocol.c#L1792
  
SSSD currently retunrs different codes which makes Kerberos to differentiate between Heimdal and sssd implementation and this leads to errors like: https://github.com/krb5/krb5/pull/1178#issuecomment-838289703

Sanity testing only.

Pushed PR: https://github.com/SSSD/sssd/pull/5629

* `master`
    * 9b017dbc80cf09b3a2d7e09f771faf70d4538b4f - KCM: return KRB5_FCC_INTERNAL for unknown or not implemented operation

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (sssd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4435