@Eddieturbo TL-WPA4220 will not join Deco mesh, but if you can configure its own SSID/password you can use that to connect printer to TL-WPA4220 and your home network without impacting devices using...

@Eddieturbo What is the model name of that TP-Link power adapter?

@Eddieturbo Check if your Canon G3520 printer has Ethernet port, and if does - connect it by Ethernet cable to either Main or Satellite Deco. In some Canon printers Ethernet port may be under the...

@Tweety_63 When Deco mesh runs in Access Point mode, IP address reservation is done on ISP router to which Main Deco is connected.

vecii wrote @Alexandre. I heard in the forum that another user had suffered from a similar problem in the past. @vecii To address this part specifically. I also saw claims on that forum that rogue...

@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....