@Kimberley_j87 ONT needs to be plugged into the router's WAN port to use more than one device which is what you want.

@GeneraalSpeknek, I do my best to help and improve my networking karma. The device connection B-2 need so be untagged member and native network of 99. (That you did) Then ports along the path to the...

@Kimberley_j87 it would still work for one device if ONT is plugged into LAN port and not WAN.

@GeneraalSpeknek, sorry if I'm missing it, but what's the test switch profile look like. It should have the test (99) vlan as the native vlan and untagged member.

@Kimberley_j87 then if the WAN Port is connected to the ONT, it should work. If you have a techie friend, it might be time to bribe them with a 6-pack for some help.

@Kimberley_j87, lol... to to be specific... Router(Garage) LAN Port -> Cable that goes from garage to Lounge Internet Port -> Lounge Internet Port -> Cable -> Switch(Lounge) -> (Cable -> Device)x4