FortiToken Mobile licenses are purchased for a specified number of FortiToken Mobile tokens. Activating a FortiToken Mobile license imports the FTM tokens to FortiAuthenticator. During activation, Fortinet links the FTM license and corresponding FTM token's serial numbers with the FortiAuthenticator serial number. After activation on the FortiAuthenticator, no other FortiAuthenticator or other Fortinet products are permitted to re-use the same FTM license, however, there is no limit to how many times an FTM license can be re-activated on the same FortiAuthenticator (for example after a factory reset).
You must contact Fortinet Support to transfer a FortiToken Mobile license to a new FortiAuthenticator unit (for example for RMA or migration to a new FortiAuthenticator unit).