Proxmox HA VM MQTT - can't connect to broker when on second network

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Hi all,

I’m running haos(10.0) as a VM on Proxmox, which is working fine.
I’ve just split the network from main to IoT networks. All have connected fine.
Now that the MQTT node is on the IoT network, it can’t connect to the broker.
All firewall rules have been removed but network isolation still active and still, no connection to the broker.

This may be a Proxmox issue but not sure where to go from here. The router is a Synology RT6600AX which works well and all are connected and have static IP’s.

Thanks all