The range of the buff has always been a 22 by 22 square area centered on the avatar. So people need to be working within 10 squares of the avatar to receive it (providing they've also paid their weekly orts).
This means people will need to be working at the same skill plot, or possibly adjacent plots, depending on how the citadel is set up and where the avatar is situated. I have at times been able to position it outside the mining pot adjacent to the tree plot.
Also, this is a temporary patch until the full rework is released, in which everyone will be able to take their own buff with them to whichever plot they choose.
13-Jul-2018 22:51:22