TP-Link TL-SG3428XF | 24 Port SFP Enterprise Level Switch | L2+ Smart Managed | Omada SDN Integrated | IPv6 | Static Routing | L2/L3/L4 QoS, IGMP & LAG

The switch has 24 SFP Gigabit fiber ports and 4 10G SFP fiber ports, and 4 RJ45 Gigabit ports. I installed Gigabit SFP fiber modules (Single mode, from different brands) into some of the 24 SFP fiber ports, no data is communication, light does come on on the matching port, but no communication. When I install the same SFP modules into the 10G SFP ports, we get communication. When I install ethernet SFP modules, data is also received. So it seems like it is very finicky as to what modules you use, considering that I have other switches from many different brands that are not having issues with the SFP modules that I have. Just as a side note, I am very very experienced in networking and have been doing it since 1992, I don't know everything, and I don't claim that I am mistake free. But I do know a thing or two about networking. So I am well aware about possible issues with port isolation and VLANs and port forwarding and that is not the issue. My guess is that it does not like non TP-Link SFP fiber gigabit ports. I purchased this in Feb 24 for a project but did not get to install it till last week (April 24) which means I am out of the return window for a full refund. TP_link tech support was not helpful at all in resolving the issue, they tried, but I honestly feel like that the technical staff that I was dealing with should be a little more experienced in this product.