Watchguard Firewall X750e - Cannot ping internal lan on watchguard from TPG IPVPN

Recently we added a new TPG IPVPN Connection (MPLS Network with Hosted Firewall) to eth2 on our watchguard but cant get it to work properly (see attached picture)

For some reason i cannot ping any Sydney LAN IP Addresses (on 10.50.2.0/24 network) from QLD Office to Sydney Office.

What do i need to enable / configure on the wathguard so i can ping internal lan addresses from qld office ?

QLD Office LAN is on 10.4.26.0/24 network.
Sydney office LAN is on 10.50.2.0/24 network

From QLD office I can ping 210.10.228.14,210.10.228.13, 10.252.0.6, 10.252.0.5 OK, but if I try to ping the Watchguard LAN IP Address 10.50.2.90 or another device in the same Sydney network from QLD Office it times out. Any ideas ???

Sydney Office Watchguard Configuration is as follows:

I have 3 interfaces setup on my Watchguard x750e firewall with following parameters:

Eth0: IP: 210.10.228.14 (External) - This is connected to a ISP Managed Cisco 1900 Series Router. This is a routed subnet services TPG NBN Conneciton.
Gateway: 210.10.228.13
NetMask:255.255.255.252

Eth1: IP: 10.50.2.90 (Trusted)
Netmask: 255.255.255.0

Eth2: IP: 10.252.0.6 (External) - This is connected to a TPG NTU and is a IPVPN Connection. This also requires RIPv2 and has dynamic routing setup.
Gateway: 10.252.0.5
Netmask: 255.255.255.252
Dynamic Routing Configuration:
1. Enabled Dynamic Routing is enabled.
2. Enable RIP is enabled
Rip Configuration :
router rip
network 10.252.0.4/30
network 10.252.0.5/30
network 10.252.0.6/30
network 10.252.0.7/30

Routing Table of Watchguard looks like this:

**
** Routes
**
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
202.10.2.20     10.252.0.5      255.255.255.255 UGH       0 0          0 eth2
210.10.228.12   0.0.0.0         255.255.255.252 U         0 0          0 eth0
10.252.0.4      0.0.0.0         255.255.255.252 U         0 0          0 eth2
10.252.0.8      10.252.0.5      255.255.255.252 UG        0 0          0 eth2
10.252.0.12     10.252.0.5      255.255.255.252 UG        0 0          0 eth2
172.50.1.88     10.252.0.5      255.255.255.248 UG        0 0          0 eth2
192.168.113.0   0.0.0.0         255.255.255.0   U         0 0          0 tun0
10.50.2.0       0.0.0.0         255.255.255.0   U         0 0          0 eth1
10.4.26.0       10.252.0.5      255.255.255.0   UG        0 0          0 eth2
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo

TPG Network Diagram