/admin/master/console/whoami return sporadically 401 when in cluster

Do anybody know why whoami end point of the admin console can return 401 in a cluster configuration? I assume, that if the request hits wrong instance, then 401 is returned. Shouldn’t it be capable to run in cluster mode or is admin console is not capable of it? I have 3 load balanced (no sticky session currently) instances of keycloak. Infinispan is configured correctly, so far I can tell (accounding to metrics and logs all 3 instances see each other).

I think I found the issue: my servers were out of sync timewise (issues with ntp client).