How to Anonymize User Data in Microsoft 365 Usage Reports

The data used for Microsoft 365 usage reports comes from the Microsoft Graph. You can anonymize the data to replace references to user, group, and site names with system-generated values to protect user privacy. This works, but it reduces the usefulness of the reports by a large degree, so you should be prepared to switch to show full user data sometimes.

https://office365itpros.com/2020/12/07/anonymize-microsoft-365-usage-reports/