Edit: Another admin did something dumb. My bad.
All of my email-related Flows have been running fine since I set them up in January, but yesterday they all lost connection to the linked account (I didn't receive a notification about this).
The account in question has only a Microsoft Flow Free license, however this has always been the case, and there were no issue before.
Under Connections, the account shows that it is connected for Office 365 Outlook and Outlook.com.
Neither Office 365 or Outlook.com "Send an Email" actions will work for this account within a Flow.

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