In the Admin Centre, Reports section, when you choose Office365 usage and select 30, 90 or 180 days, does a name without any data/date listed for any O365 product identify an inactive account for the day period selected?
The default Azure token lifetime is 90 days i believe, so a regular user who checks email multiple times per day, but only uses email connected to mobile can appear to have NO activity for up to 90 days, at which point they should be forced to sign in again, correct?
Do the 30, 90 and 180 day periods mean "in the last n days" or something else?
The default token lifetime is unlimited, and has been like that for at least an year. But the report in question doesn't represents "login" activity, but actions taken by the user for a given workload.