Before you proceed, note that by default everyone at the iSchool (and everyone else at the UW that uses the UW Microsoft 365/Office 365 service) can already see the default free/busy info of everyone else. This means people can already see when you are free, when you are busy, what your working hours are and when you are out of the office.
“Advanced” sharing options are possible if you want to give someone access to more details. This could be allowing someone outside of UW the chance to view to your calendar, or if you want to give someone “delegate” (edit) rights to your calendar.
It is recommended that you configure “advanced” sharing options using the Outlook Web App. Detailed directions from Microsoft are available on this web page: Advanced Microsoft 365 Calendar sharing directions.