https://docs.sophos.com/nsg/sophos-firewall/19.5/Help/en-us/webhelp/onlinehelp/AdministratorHelp/Administration/Licensing/AdministrationNoLicenseSynchronizationPeriod/index.htmlWork around:
Access Sophos Firewall UI select>diagnostics>tools>under Name lookup tool test the connection to "eu-prod-utm.soa.sophos.com" w/o quote.
If successfully able to lookup then again try to initiate synchronize button. under Administration>licensing
Else if the above procedure won't work we recommend you email us at support@npi.ph.