Problems connecting three media players to my network

I have two streaming players and an older WD Live Plus player and I cannot seem to have all three connect to my network at the same time.  Two are connected with the help of powerline adapters and the third directly to the router. I am not the most tech savvy so any suggestions would be greatly appreciated.

Make sure they all have UNIQUE NAMES in the NETWORK SETTINGS options.

Yes, they all have different names in the network settings option.

Do they all have unique IP addresses?