I've got unifi working, with a guest SSID and a normal SSID.  All going great.

THe guest access is working as advertised.  Same VLAN and subnet and has no access to the rest of my network.  But what I'd like to do, is given them access  to my apple tv for air play, and chromecast for casting.

This version on unifi specifies a post authorization - which I have 192.168.10.0/24.  I do have pre authorisation set to 192.168.10.32/29 192.168.10.33 - 192.168.10.38 (which is where I've just put the apple tv and chrome cast).

But they don't seem to show up.

I have no reason not to do a VLAN if it will help.  My switch TP Link  SG1024 supports vlans (but I've only got the one AP at the moment), but I understood to do a vlan I'd need another dhcp server somehow, and I wasn't sure how I'd introduce that.