@Kajetan321 the vip just points to one of them, whoever is the master. So yeah to it the name is not correct.
What you would want to setup is alternative name..
systemadv.jpg
so if you pfsense1.home.arpa, and pfsense2.home.arpa on the 2 boxes. Here for the vip name you would want pfsense.home.arpa
This is located under system / advanced / admin access