To give a player or group access to a rankup, they need access to the permission node associated with it! Without it EZRanksPro does not know what rankup they have access to. If you create a rankup for rank A to B, you will need to give the A rank the permission node:
ezranks.rank.A. This will tell EZRanksPro that players in A should have the rankup associated with A. Players can have access to multiple
ezranks.rank. permission nodes, the highest order rankup will always be applied for the player.