Well ok, further observation.
Not much to see in krb5kdc.log, just same 'revoked credentials' for admin
However
When looking at ipa user-status admin after ipa user-unlock admin, i can see the Failed logins are increasing to 6 whithin 5-10 seconds. Same happening on both masters, ipa user-unlock admin, then 1,2..6 failed logins within few seconds.
What can cause those failed logins in theory and where it can be logged please advise?
Thanks a lot