To use the Quantize feature in the PRO DJ LINK network, you'll need grid information of the track from the multi player.
In this case, the [PLAYER No.] of the multi player and the connected channel number must match.
For details, see the PRO DJ LINK Setup Guide.
You can find the PRO DJ LINK Setup Guide [here].
Note: You can't use the Quantize feature if the track being played on the multi player hasn't been analyzed by rekordbox.