Yamaha MonitorMix User Manual page 9

If the number of MonitorMix connected to a mixer already exceeds
the maximum allowed (10), a block mark will appear on the left of
the IP address. Selecting a mixer with a block mark and pressing
the [Connect] button will result in an error message indicating that
connection is refused.
When MonitorMix has finished acquiring bus information from the mixer,
the SELECT AUX screen (TF series) or SELECT MIX/MATRIX screen
(CL/QL series) will appear.
Select the bus used for your own monitor mix from the list provided.
Tap [Done] to start synchronizing data. Tap [Cancel] to return to the
SELECT MIXER screen.
The FADER screen will appear when data synchronization is complete,
ending the MonitorMix preparation process.
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MonitorMix User Guide