Unfortunately not all columns are sort-able.
And "Last Used" is one of those which cannot be sorted.
That's the limitation of current version of FortiAuthenticator.
Only list of hardware models of FortiTokens can be exported out via "Export FTK Hardware" menu button. No export for FortiToken Mobile, or Cloud models, as well as for 3rd party tokens (Yubikey).
Part of the reason is the difference between hardware and software (Mobile) FortiToken models and how they do activate in FortiAuthenticator.
Hardware models are independent and so imported as a list of tokens, or as individual units. While FortiToken Mobile units are imported as a bundle via license, and therefore no list is needed and those also cannot be imported as individual units without respective license being already assigned/bonded-to FortiAuthenticator unit.
Alternative approach to export and sorting functions might be in REST API.
Kindly have a look to : https://docs.fortinet.com/document/fortiauthenticator/6.3.3/rest-api-solution-guide/875895/fortitoke...
Tom xSilver, planet Earth, over and out!