OK guys, I have seen a lot of discussion on here about problems experienced when trying to use KEF speakers with a mesh system and how difficult it can be.
I have some KEF LSX IIs and a TP link Deco X60 mesh with a Luxul modem.
I was experiencing all the same problems - I could see the LSX IIs on the wi-fi network and could cast to them from the KEF app but my roon simply would not see them at all.
In the end I got my friend and IT guru to have a look and there is a very simple fix.
He changed the Operation Mode settings on the TP Link (via the app) from the default mode (which is wi-fi router) to AP or Access Point mode.
Hey presto, the Kef’s are back in the Audio option on Roon. Work beautifully and no more problems.
I hope this info is helpful for those experiencing connection problems with KEF and Mesh wi fi systems.