@rhohltjr 

The TL-PA4010s use the HomePlug AV standard meaning they need to be on the same circuit. Or other words, your choice of outlets that you can potentially use are limited.

Just to see if they are capable of working, have them both plugged into the same room or in the room of the router. Once that works, take the second adapter and try the outlet you would like. If the powerline light does not turn on, you must use a different outlet. If it will work the light will just turn on, there is nothing additional to do.

Wonder what the (cheaper less bandwidth capable) ones I am using now use?   

I'm guessing not Homeplug AV Standard since they work. 

I suppose it all goes back to the breaker box where the house wiring is rooted to the main bus.

These TL-PA4010s can't find the right breaker from the main bus to make a connection at the outlets.

And the others do.

Thanks.

Update to above.  I've plugged them both into the same outlet and they still can't find each other.  Useless.

Live and learn I suppose.

RHJ