Remote Access -- Help Needed

Hello!

I have setup Duckdns and Port forwarding for my Raspberry Pi running Hassio.

The Raspberry Pi is connected to my Home Broadband which uses IPv4.

The thing is I can remotely loging to my Hassio from my Phone if it is connected to Wifi ( even my office wifi works as it uses IPv4 )

But I cannot use my LTE to connect to Hassio as it uses IPv6.

Am I missing something?

HELP!!!