There is no report showing user creation data. This should be part of the Azure interface (user add/modify/delete, access rights add/modify/delete)
Furthermore, for user inactivity, login activity summary report shows a summary of the number of logins per user in a specific time period. The Login Activity Log Report shows each and every log in however, If you want an overview of all users which have been inactive for a specific period of time, you have to extract the data to excel and do the mapping of these reports against the list of all users, to identify which users has not been active.
Lastly, There is no report available for changes of the calculation engine and a report which shows changes to email notifications in the workflow.
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