I have 4 round-pole gates all locked and set to use the same master key. Two gates on one claim, 2 on a second claim a screen away. Created a slave key to carry around with me. 3 of the gates work fine from both directions, but one gate only works from a single direction. The side on this one gate (in this case from the outside attempting to go in) where it doesn't work gives an message that I need the Master Key.
Does the direction the gate swings make a difference (would mean there is an actual front and back side)? Or which side of the gate you applied the lock to?