Why I can't use nmap to scan LAME machine of Beginner Track?

I am a beginners in HTB and try to practice by Beginner Track.
But I can’t use nmap to scan LAME machine.I know which maybe blocked by firewall.
However, I found there is not a firewall in the machine when I saw the writeups.

I think it’s because the machine’s IP subnet is not the same as my PwonBox?
Can everyone give me some hints?

nmap -sC -sV
Starting Nmap 7.91 ( https://nmap.org ) at 2021-10-31 03:56 UTC
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 3.68 seconds

add -Pn at the end of the command