@Alexandre. I realy don't no. I started the installation process again. Took your tips into account. Now it works. I havent't changed anything about the switch settings. Thanks .

@Alexandre. Thanks, now it is working.

Hello I have a Deco BE85 and a Deco X50 Outdoor. System: Deco BE85 ----> TL-SG3428X switch ---> TL-SG108PE ---> Deco X50 However, the Ethernet backhaul does not work. There is only wifi connection...