Issue:  Errors in krb5_child.log every time a user authenticates - Pre-authentication failed: No pkinit_anchors supplied

NOTE: User authentication is working fine.

Expected results: The krb5_child.log should not contain "Pre-authentication failed: No pkinit_anchors supplied" error after every successful authentication.

Actual results: The logs are filled with these errors:

~~~~

Dec 28 05:00:46 dc01zld0141 krb5_child[1758711]: Pre-authentication failed: No pkinit_anchors supplied
Dec 28 05:00:46 dc01zld0155 krb5_child[1732435]: Pre-authentication failed: No pkinit_anchors supplied
Dec 28 05:00:46 dc01zld0147 krb5_child[657019]: Pre-authentication failed: No pkinit_anchors supplied
Dec 28 05:00:47 dc01zld0148 krb5_child[666607]: Pre-authentication failed: No pkinit_anchors supplied
Dec 28 05:03:51 dc01zld0143 krb5_child[700393]: Pre-authentication failed: No pkinit_anchors supplied
Dec 28 05:03:51 dc01zld0138 krb5_child[1748037]: Pre-authentication failed: No pkinit_anchors supplied

~~~~

Steps Taken:

Added "pkinit_anchors = FILE:/etc/pki/tls/certs/ca-bundle.crt" line in krb5.conf file.

Now, the following error can be seen in the krb5_child logs:
--------
[112262] 1705492282.364723: PKINIT client has no configured identity; giving up
[112262] 1705492282.364724: PKINIT client has no configured identity; giving up
[112262] 1705492282.364725: Preauth module pkinit (16) (real) returned: 22/Invalid argument
--------

>> How do we get rid of those errors?