The setup I have worked correctly with a Superhub 2.0 but does not work with a Superhub 3.0. I am currently in contact with TP Link UK Support. I have sent them all the info they requested. I have...

This is not a topology mistake; you are wrong. This configuration is specifically allowed for in https://www.tp-link.com/uk/support/faq/2399/ I have exactly the same problem and there seems to be...