If anyone out there has the suspicion someone may have logged into and used your Microsoft account, you can review the last 30 days of actvity from this Microsoft page.
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Interested users can also find more information in Susan Bradley's Tasks for the Weekend March 6 – Check Your Logins on the AskWoody com site. That post includes a link to her YouTube video "Tasks for the Weekend - March 6, 2021 - Check Your Accounts" at https://www.youtube.com/watch?v=39FO6BQDjSk - the latest entry in her excellent "Tasks for the Weekend" series of videos.