Make certain you have JP language enabled on your profile settings since you're on a JP data center. The majority of players there will only have JP enabled and Duty Finder matches players to groups based on language settings. That makes it hard to get matched to a group if you only have a different language selected. You don't need to be able to speak JP but knowing how to use the auto-translator may be helpful at times.
If you haven't used the auto-translator before, you may want to play with it a bit to see what phrases are available.
https://ffxiv.gamerescape.com/wiki/Auto-Translator
I've been told that if you're using a controller, it's opened using the R1 key though I don't know what you'd use for the paging commands.