We are excited to announce that we have launched our new Hive Community! HiveNation will remain as an archive, but all new posts, discussions, and articles will be created on Hive Community. You can visit our new community at thehivecommunity.aerohive.com
Two things that come to mind; capwap and licensing. First, are you using Hivemanager online or on-prem? Is there a firewall between your APs and Hivemanager? If so, capwap traffic is probably not permitted. This should be enough to get you started.