Hi There, I have an existing powerline network of three TL-PA4010P adapters to extend my wired connection around the house. They are working just fine. I have now purchased a single wireless adapter (TL-WPA4220) just to extend my wifi in a spare bedroom. I was under the impression these adapters are compatible with each other. However, I have tried everything possible but I am unable to get the powerline LED to activate on the new adapter. Any ideas if I'm doing something wrong??