Remote Management

I've seen a few posts but not seeing any resolution unless I"m missing it. I have Nortons on 3 computers. I was able to see 3 devices. I tried to rename them under devices so I knew which was which as they were all under the same name for each computer. Something happened and I ended up having to uninstall and then reinstall Norton's on 2 computers. Now those 2 devices don't show and only one does. Remote management is one for of course the one that shows. Remote Management is greyed out on the other two and have no clue how to get them to turn on so I can see all 3 devices under the device tab. Any clues or help would be greatly appreciated.

Thanks