Changing the IP address for any reason from the GUI or CLI will fail the license.
The process to solve that issue is as follow:
Go to Manage product -> Information -> General and choose the virtual machine for FortiAuthenticator.
Choose the Edit Product information option and there, change the new IP to be assigned:
Save the changes and download the license file.
Go to the GUI and update the license file.
Reboot, the system will be operational once again.
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