They can ping each other but can they see each other at Mint level.
Run command: >show mint neighbors
Are they able to see each other?
On one of the APs check the mint Id (>show mint-id) then mint ping it from the VC:
>en
#mint ping
Is it successful?
Have you tried rebooting the APs after the changes have been made?
You haven't told us if the APs are plugged into a routed (layer 3) or layer 2 switch.
Christoph S.