Can you still view it locally? what's the status of LED on NC200? Is it still solid green? If it's not, you may need to reconnect it to your router.

as far as i know, C9 is a igmp proxy only. so it can't be the server for igmp client. did you create server in the network? sorry, i am not professional on this. maybe you can contact tp-link emai...

thanks for sharing with us, good post!

what device your roommate is using? maybe there is a compatibility issue. you can report to tp-link email support to see if they can help you.

as long as your printer ip is in the same subnet of your WiFI and LAN device, they should be able to print.

normally WiFi lan of Archer can access switch lan while switch lan can't access the Wi-Fi lan as it is protected by Archer c7. i don't know what you want to do. basically if you want to make Archer...