@Don.M I understand and will purchase one. But it seems strange that 3 different switches are behaving the same way.

@TP-Link 1) Yes, the switch is a TL-SG108 2) The inverters use DHCP and they work fine when plugged into the Deco but not the switch. 3) At this point I don't have a computer with ethernet capability...

Great! Are you able to ping the gateway on the two devices -192.168.68.1? I can only ping one at a time on the deco since it only has one port. They won't ping on the switch. Can I have a screenshot...

@TP-Link Yes, IP one: 192.168.68.120 IP two: 192.168.68.121 I tried swapping decos with the switch and devices with the same results. ISP is Spectrum

@TP-Link The Deco in question is the main one. The ethernet on the Deco works fine. The problem is with the SG108 switch. I have power and activity lights but there seems to be no internet connection...

I have a Deco M5 and a TL-SG108 unmanaged switch. My two devices plugged into the switch will not connect to the internet. However, they do work if I disconnect the switch and plug one in at a time...