Need solution to this error on all retired machine i am facing!

Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn
Nmap done: 1 IP address (0 hosts up) scanned in 3.05 seconds

whenever i am scanning target getting same error also with -Pn no result is coming so anyone know then help me out!!!

You appear new to the community. Welcome! The retired machines have to be spawned on your account individually. Also, only a couple of retired machines are available in the free tier. If you pay for a VIP subscription which costs ~$10 USD per month and a great investment, (you are welcome HTB) you are allowed to spin up one retired machine at a time to work on. You should try to ping the active machines - then try the two retired nodes (Paper and Phoenix) to make sure your openvpn config is working.