I've seen a lot of discussion of this topic but none of the fixes work. I have 2 routers in the mesh. The printer connects to the WiFi but fails to get a DHCP lease. Even if I fix the IP address, I cannot ping it. It looks like there is no route to the printer.

However, if I turn off one of the routers, it all works and I can see the printer. It looks like the printer and the computer need to be on the same router for it to work. 

I have Fast Roaming disabled (which was one of the suggestions).