The permanent license key requires an IP address. This is usually mapped to the eth0 interface. So if you can login to the CLI, you can double check.
For AMP 8.2.3 and prior
# ifconfig eth0
For AMP 8.2.4 and newer
Option 8 (advanced)
Option 3 (configure network settings)
And then 0 to exit w/o making any changes
Once you have the IP, you can just submit it to support to get the permanent key.