Site to Site VPN Nat Issues

We are using an internet connection that has been given to us by the current building owners.

I have an ASG behind another firewall.

I can create an IPSec VPN Tunnel from my office to a central ASG.

All devices are pingable from one side to another.

The same config is setup with Full NAT ( ANY setup in Local Networks ) from another office.

This office for whatever reason does not want to run in a full nat.

If I look at the IKE status for the new office this is what I get

Auth PSK / Enc AES_CBC_256 / Hash HMAC_MD5 / Lifetime 7800s / NAT-T / DPD

The NAT-T entry is not in our second office.

Any clues as to how to fix this?