Host not building

I have 2 foreman server my hosts are configured to old foreman server when i’m trying to build the hosts on new foreman-server they just boot from hard drive although I’m able to migrate them to new foreman server manually and after restart they would still boot from Hard drive and not getting build from new foreman server which is on version 3.2.1
Expected outcome:
To get the host build with new foreman-server
Foreman and Proxy versions:

Foreman and Proxy plugin versions:

Distribution and version:
Centos 7
Other relevant data: