Normally when you register the license on the HPE portal, you can also search and find the license again on the HPE portal. If not, I would also suggest to open a TAC case.
With regards to the APs. Several issues can prevent the APs from showing up in the controller.
During the boot process the AP has several ways to contact the controller. The auto-discovery of the controller is possible via multiple options, like:
- Broadcast (ADP - Aruba Discovery Protocol): the access-points and controller(s) are in the same VLAN;
- DHCP option 43
- DNS record "aruba-master.<domain-name>"
Another issue could be the configuration of Control Plane Security. Do you have cp-sec (control plane security) enabled without the Auto Cert Provisioning option? If so, you must manually provision the APs to the AP white-list first before they show up in the controller. When you go to the Configuration tab and you see a flag next to "Save Configuration" it means that the controller is denying one or more APs access.
A good way to troubleshoot is to check what's happing on the console of the access-point during the boot process.