Ppp0 disconnected

Hello, I want to make an ethernet and wifi router using the clipper hat mini 4G module.

I strictly followed the steps in the “Getting Started With Clipper HAT Mini” guide

In the end If I do an « nmcli d » I see a PPP0 device but it is “disconnected”

if I do an « nmcli c » I don’t have a new connection

What should I do

Thank you