Technical Tip: 'ISDB license expired' inside of an update debug, even though the licenses are valid

If the Internet Service database is failing to be downloaded, usually an update debug is run to see why it cannot be downloaded:

diagnose debug reset

diagnose debug app update -1

diagnose debug enable

Inside of this debug, it may be possible to see 'ISDB license expired', even if the licenses are valid.
See the following output for example:

upd_status_set_ha_expiry[1511]-Serial Number: FG3H0E1234567YYY.- contract processed
upd_status_set_ha_expiry[1477]-Extracting contract...(SupportLevelDesc=05:Advanced HW*06:Web/Online*20:Premium)

upd_status_set_ha_expiry[1477]-Extracting contract...(SupportTypeDesc=AVDB:Advanced Malware Protection*COMP:*ENHN:*FMWR:Firmware & General Updates*FRVS:Vulnerability Management*FURL:FortiGuard URL, DNS & Video Filtering Serv
ice*HDWR:Hardware*NIDS:FortiGuard IPS Service*SPAM:AntiSpam*SPRT:*ZHVO:FortiGuard Virus Outbreak Protection Service)

__update_upd_comp_by_contract[432]-ISDB license expired. 

This error can be generated when the option to update ISDB objects was disabled under 'config system fortiguard':

config system fortiguard
    set update-ffdb disable
end

Once set to 'enable', the ISDB database was able to be downloaded successfully.