Again please read my previous texts, adding a specific device is not an option either. I don't think it is relevant to get into fine details of my personal situation however it is due to multiple different devices on the network at once with regular sharing of devices between people doing different tasks and multiple different games being played at once. It is crucial for my situation that I can specify certain games to have high priority not devices or gaming as a whole.
Also as an update I found out that a service called exit lag, which optimises routing to gaming servers, is running on the computer. When turned off Fortnite is now recognised by the router. This is a temporary fix for me as apparently exit lag is needed to be on and running again soon and I checked with the exit lag team who informed me they do not encrypt any data and there shouldn't be an issue from there end. Would you know why this service causes a clash with the router?
thank you for your fast responses.