Hologram ssh with ppp connection

Hello I’m new here!

I used “sudo hologram network connect” to set up a connection in Raspberry Pi 3B

I have the IP address of the PPP connection using ifconfig

when I use “sudo ststemctl status ssh” it showed that the ssh server was started

but I cannot ssh into my RPi using the PPP IP address.

I’m using modem : Nova U201, and hologram IoT sim card in the Packet Nova R401, I know 3G is sunseted, but I can still send and receive messages with dashboard using hologram CLI.

I could use ssh with IP address associated to WLAN0.

Why the difference and how to ssh using PPP connection? Thank you.