2020 Update: Microsoft is still working on implementing an out-of-the-box solution for this as of February 2020. I’ve made a few wording updates to the steps below to make the steps a bit more clear.
Per this UserVoice post, Microsoft is working to make Group Calendars native to Microsoft Teams via the “Meetings”/Calendar view, but below you’ll find one potential workaround in the meantime. Please note that the below workaround may not work for users with On Premise mailboxes.
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