Have you tried speaking to Virgin? The ethernet port on the hub needs to support 10 Mbit half-duplex connections to support the Tado bridge
If their router can't support that then the easiest option is to purchase a small network switch that can support that connection and connect it between the router and bridge
Running mine on the hub 5 for over a year with no problems, I just plugged it into a port on the hub
@greg01491 You could try the TP-Link devices. E.g. https://www.amazon.co.uk/TP-Link-LS1005G-Wallmount-Ethernet-Splitter/dp/B07VWB347G/ref=psdc_430573031_t3_B07PYSNSDD?th=1
Less than tenner, should auto-negotiate speeds with your Virgin router and the Tado device. If it doesn;t work, it should be returnable.
Our rellie is using a Wi-Fi extender, TP-Link AC1200 (?), with an ethernet port to connect their Tado dongle to the Virgin home wifi network.
I'm new to VM and having the same issue. Did you manage to get it sorted?
I wonder how mine just connected and been running fine for a year now, maybe different hub versions
Virgin hubs are rubbish. Set it to modem only mode and connect it to a proper router.