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I realize this may not be possible in an office environment but is there any chance you can hardwire both speakers to the network. Depending on how locked down the network is, this could inspire a nasty-gram from IT about connecting unauthorized devices to the network.
Another troubleshooting question is whether the 2nd Emerge can run successfully on wifi as a standalone, and, if so, can you send music from one to the other (not in stereo)
Some office wifi networks are configured so devices can only talk to the internet, not to each other. You would need special privileges assigned by the network admin to allow them to talk to each other if this were the case.