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You can't create a Teams meeting directly in a shared calendar by creating a new meeting and clicking the Teams Meeting button - this is because the Shared Calendar Account doesn't have a Teams account associated with it. You will receive the error "Sorry, but we can't connect to the server right now. Please try again later" - the work-around is to create the meeting in your own calendar, and then invite the shared-calendar or copy-and-paste the "Join the Teams Meeting" link from your meeting into a new meeting on the shared calendar.
I don't have a "Teams Meeting" or "New Teams Meeting" button in Outlook (on Windows), or clicking it does nothing - what do I do?
We have a guidance page on how to re-enable the Teams Addin in Outlook for Windows here: /wiki/spaces/SD/pages/28379658/wiki/spaces/SD/pages/28379658
I have no "Teams Meeting" button in Outlook for Mac.
Outlook for Mac does not currently support the Teams plugin, so there is no Teams Meeting button for Mac.