I could not get the Nintendo 2DS to load anything on his device. We temporarily put in the password for the parent wi-fi and connected to that "blocked by koala" site and it said "this site should be blocked."
He is now updating his system software on the 2DS because he has not used it for several months. Then I will erase the main parent wi-fi password from his 2DS and try connecting him to the KoalaSafe router again.
I went to his profile just now, clicked "devices," then pressed the plus sign in the upper right corner and his 2DS still did not appear as an option to add to his devices.
Another funny twist: I just went on "Netgear Genie" which supposedly is a way to control my main router that KoalaSafe is plugged into. His 2DS is now connected to that router but the 2DS is not showing up as one of the 10 "connected devices" on Netgear Genie! I don't really understand what is going on. Maybe someone who understands how this stuff works can explain it to me.