I do not like it when a newly installed environment has event log entries with other than informational events, especially if these warnings are recurring. But I guess this one is an example which can be safely ignored. By design the KDC service periodically tries to locate a Certificate Authority to request a certificate. When no CA is present, warnings are logged.
The event: event id 29, source: Microsoft-Windows-Kerberos-Key-Distribution-Center
The Key Distribution Center (KDC) cannot find a suitable certificate to use for smart card logons, or the KDC certificate could not be verified. Smart card logon may not function correctly if this problem is not resolved. To correct this problem, either verify the existing KDC certificate using certutil.exe or enroll for a new KDC certificate.
Additional information KB967623