Hi @joseph- Thanks. I solved it by changing the position of the wifi unit of the tp-link 7610. I did the single pair between each Wifi unit and the master of the TP-Link 7817 and now they both work....

Hi, I already had the Powerline TP-Link 7610 Kit. Now I bought the Powerline TP-Link 7817 Kit I connected the master unit of the 7817 to the Tim router and it hooks up perfectly to the wifi unit...