Point own domain to free account

I have two accounts of free 000webhost. On both account I have the free version of 000webhost. In one account, I have a website wich I pointed to my own domain (“example.com”). I think I did it with parked domains.
The problem is with another website, in the other account I have a website wich I can not point to my own domain (example2 .com). It says I need to upgrade my account but in the free version I read I can do this, and with the other website I could point my own domain.
Any solutions? Is 000webhost having problems? If so, how many time will the problems persist?
Waiting for an answer,

The free version no longer offers the domain feature at all.

Free forwarding at your domain registrar is working.