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Enable default VLAN network then in VM assign NIC on the VLAN - see https://docs.harvesterhci.io/v1.0/networking/harvester-network/#vlan-network

Thanks Simon. Not sure how to do that.

I don't know OVHCloud but for normally you'd set default VLAN to 1 as per above link, then in VM choose the new network - you will need to shut VM down first