Hello,
Do you have a public IP address ? To check from the UI go to Network->Interfaces, look at MOB1S1A1 (or MOB1S2A1) and look at the IP field. If it is a 10.x.y.z, 172.[16-31].x.y or 192.168.x.y it is a private address and it is not routable, it cannot be reached from the outside world.
A solution would be to use a VPN, in this case Zerotier would do.
Regards,