@vecii Your concerns are understandable. In your case, it would make sense to get WiFi mesh with whitelist (allow list) feature, which lets you explicitely permit devices to join your WiFi network....

@pasta6649 Great. Then, I have simple solution for you: switch Deco mesh to Access Point mode and everything should work again. See Switching a Deco to Access Point (AP) Mode In Deco AP mode your wan...

@pasta6649 Do you have Main Deco connected to the main WAN router?

@vecii It is your iPhone or iPad most likely. The feature is called "Private WiFi Address," also known as "MAC address randomization." This is how to turn it off for Deco mesh SSID in your Apple...

@Taffy4400 You can only run Deco mesh in Access Point mode if your main modem/router runs in its default router (or gateway) mode. Assuming you haven't made any changes in your main modem/router, or...

@Acastello You can't pair TL-WPA7617 with Deco mesh. If you want powerline extension of your Deco P9 mesh, your only options are Deco P7 and Deco P9.