I have a client experiencing this issue as well. Theirs is one Laserfiche Directory user. Seems to disable it for 5 minutes and then re-enable it on its own. The error below seems to relate as well. Was there a resolution found for this by chance?
ERROR MESSAGE:
Laserfiche.LicenseManager.TrusteeNotFoundException: Attribute UPN not found
at Laserfiche.LicenseManager.LicenseManagerService.GetUnsignedToken(LicenseDatabase database, GetUnsignedTokenParameters parameters)
at Laserfiche.LicenseManager.LicenseManagerService.GetUnsignedTokenEx(LicenseManagerServiceCallArgs _args)
at Laserfiche.LicenseManager.LicenseManagerService.DispatchFunction(LicenseManagerServiceCall func, LicenseManagerServiceCallArgs args)
Type:
Laserfiche.LicenseManager.TrusteeNotFoundException
Stack Trace:
at Laserfiche.LicenseManager.LicenseManagerService.GetUnsignedToken(LicenseDatabase database, GetUnsignedTokenParameters parameters)
at Laserfiche.LicenseManager.LicenseManagerService.GetUnsignedTokenEx(LicenseManagerServiceCallArgs _args)
at Laserfiche.LicenseManager.LicenseManagerService.DispatchFunction(LicenseManagerServiceCall func, LicenseManagerServiceCallArgs args)