Telit LE910C1-EU - iliad - wwan0 got no ipv4

Hi Everyone,
This is the issue:

i followed this guidehttps://docs.sixfab.com/page/internet-connection-with-telit-le910c1-module-using-ecm-mode

set up AT+CGDCONT like this: AT+CGDCONT=1,"IP","iliad"

Results:

AT+CREG?
+CREG: 0,1

OK
AT+CGDCONT?
+CGDCONT: 1,"IP","iliad","",0,0,0,0
+CGDCONT: 2,"IPV4V6","internet.it","",0,0,0,0
+CGDCONT: 3,"IPV4V6","sos","",0,0,0,1

OK

AT+CGCONTRDP=1
+CGCONTRDP: 1,5,iliad,"10.164.33.67.255.255.255.248","10.164.33.68

AT+COPS?
+COPS: 0,0,"Iliad",7

but, from ifconfig:

~$ ifconfig wwan0
wwan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet6 fe80::28f7:ceff:feb2:9c3b  prefixlen 64  scopeid 0x20<link>
        ether 2a:f7:ce:b2:9c:3b  txqueuelen 1000  (Ethernet)
        RX packets 6  bytes 312 (312.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 34  bytes 3787 (3.7 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
~$ ping -I wwan0 -c 5 8.8.8.8
ping: Warning: source address might be selected on device other than wwan0.
PING 8.8.8.8 (8.8.8.8) from 192.168.244.191 wwan0: 56(84) bytes of data.

--- 8.8.8.8 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4089ms

I have no ipv4 address, how come? what can I do to fix it and navigate?

Thanks