@jgraaf3 PC rebooted after network adapter reset, right? Because, if it did not, these weren't right steps or were incomplete steps. Deco mesh in AP mode does little more than passing traffic. You...

@jgraaf3 Was it always like that, meaning since first time you connected PC to Deco (or Deco to PC), or is it started recently? While I am waiting for your reply, if this is Windows computer I...

@KuroYami Bring Satellite Deco to the room where Main Deco is, power on Satellite Deco and do not connect it with Ethernet cable. The purpose of this is to check if Satellite Deco will connect to...

@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...