[Freeipa-users] Can login with non-existing user

I have managed to login to an IPA client with a non-existing user. My AD user is z123456(a)addomain.mydomain.at and I have created a similar user called i123456(a)ipadomain.mydomain.at. What happened now is that I could log in with the i-User and what I get to see after logging in is this: [i123456@addomain.mydomain.at(a)as12314 ~]$ id uid=1246600007(i123456(a)addomain.mydomain.at) gid=1246600007(i123456(a)addomain.mydomain.at) groups=1246600007(i123456@addomain.mydomain.at),1246600016(my-ad-group(a)ipadomain.mydomain.at) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 [i123456@addomain.mydomain.at(a)as12314 ~]$ whoami i123456(a)addomain.mydomain.at The user i123456(a)addomain.mydomain.at does NOT exist. addomain is set as default domain in the client's sssd.conf. What is wrong here? Are things just displayed wrong or could it be more? Which files do you need in order to analyze this issue? Cheers, Ronald