@rehamkcirtap i know you specifically require a POE switch but I recently bought 2 x SG1024DE smart switches for my future vlan set up. As you say i have also found them ,in my limited experience, easy to use and they do what it says on the tin. I had no problems connecting them up to my router. They"just worked". They may make a POE version of this switch.
Regarding your present problem before returning it might be an idea to remove the switch from the system and try the following
Reset switch. See screen grab taken from my manual. Your reset button might be in a different spot
Plug PC into switch with a known good patch cable. With nothing else connected and both powered on
See if you can access the switch WebUI. See screen grab. Again this is taken from my manual but the default IP of your switch should be the same.
If your still having no joy see the last 2 screens taken from manual. It explains what you have to do to get the pc and the switch "talking". The switch has a default IP of 192.168.0.1 so it's important to give the pc another address number. Try 192.168.0.250 for example
If this works works and you can access the switch webUI. Your getting somewhere lol.
The next step is to try
@flintstones 1 cam only method
Good luck