Remote Connection

Good day
I have two client Edition of the Vision Limited Module ( 1 Local and 1 remote client) for two different locations, i indented to have a central location where each can be view on a single workstation.
i was able to create a remote connection from the gateway settings for each which was successful and also the remote tags from the realtime under Tags.
i was not able to view the tags from the central system.
which of the license key will i use on the central system where i intend to view both locations?
Please kindly support me on this