APM, Kerberos and SSO

I wonder why my logs (after setting Debug for SSO) do not contain similar entries as listed in article https://devcentral.f5.com/s/articles/apm-cookbook-single-sign-on-sso-using-kerberos. I am talking especially about all entries with TGT. Just nothing like that in my log. Does that mean that SSO is not working? Or I have to set Debug for some other services in APM log profile (right now Debug is only for SSO)? Piotr