Yes, I also heard about this from someone who has an XZs. He called in support, and they said the Xperia Keyboard is incompatible.
I for my part cannot understand it, seeing I am using it on my XZP and find it very strange that it ain't working (apparently) on the XZs.
I would just assume Sony did not want to test it for the XZs.
But this is something we see everywhere with Sony devices, Sony downgrading their Software until the last faithfull customer has moved on. A real pity 😞
