I use in outlook 2016 with exchange 2016
It possible to add local exchange calendar to microsoft teams ?
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If it is a calendar in a tab in a channel that is possible by adding a web page with a link to the calendar, not the best way maybe.https://techcommunity.microsoft.com/t5/microsoft-teams/calendar-options-in-ms-teams/m-p/50685
If you want to see your own calendar in Teams that is possible with Exchange Server 2016, if it doesn't work see this thread with some suggestions how to solve it (as an admin).