Doing an implementation of SAM Pro recently and enabling the O365 Usage integration. (Microsoft Office365 Integration Profile).
Microsoft Announcement MC275344
Privacy changes to Microsoft 365 Usage Analytics
Microsoft has introduced a breaking change to reports that obfuscates the User Principal Name (userPrincipalName) to a GUID. Unfortunately this breaks the underlying Script Includes doing the pulls from Office365 to match up User Activity/Detail to the users in the sys_user table. Essentially you get a bunch of samp_sw_usage records with the users being empty.
Microsoft has a setting in the Office365 Admin center to disable this obfuscation (on by default).
https://docs.microsoft.com/en-us/answers/questions/420250/ms365-some-reports-showing-guid.html
Hope this helps anyone running into this.
