@JamHam Hi, welcome to our community. Could you share the MAC address of your main Deco via the "Message"? Could you still see your old TP-Link account on the Deco app?

@Rouffian Hi,thanks for posting question here. When adding satellite Decos, please put it near the main Deco in the same room. After adding successfully, you may relocate it to other places. And this...

@Matthew3798 Hi, welcome to our community. As you said, your house is big and walls are thick, so the performance may be greatly influenced by that. You may refer to this guide first and make sure...

@Nickolaj Hi, welcome to our community. Could you share the screenshots of the page on Deco app to show how your Decos connect to each other? Please share your exact network topology. It is suggested...

@Nikosantis Hi, thanks for your detailed update. Do you have a wired PC? It is suggested to change Ethernet cable between your ISP router and main Deco. Then if you have a wired PC, it is suggested...

@redex Hi, to assist you efficiently, I've forwarded your case to the TP-Link support engineers who will contact you with your registered email address later. Please pay attention to your email box...