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Hi @soldacre . Is it this model?
Archer AXE75 | AXE5400 Tri-Band Gigabit Wi-Fi 6E Router (single unit)
Or
Deco XE75 | AXE5400 Tri-Band Gigabit Wi-Fi 6E Router (multi unit mesh)
Either way, you have to set VLAN ID=2 somewhere in the router admin.
Are you a new connection, or it has been working before and you are upgrading router?
@soldacre . Try this.
Go to Advanced > Network > IPTV/VLAN.
Tick Enable IPTV/VLAN.
Select Custom mode.
The following depends on what is in your model. This is from a similar model.