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Many thanks Vasil that was the issue.
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Hello Experts, <br />
<br />
Im facing an issue when trying to check the user email acticity or any Office 365 service from usage tab, all users display name are encripted with numbera &amp;&nbsp;letters like that &nbsp;djcbxnx28284nznz and not the normal way which is email. I tried different tenant to just confirm if the issue from Microsoft side or not but actually found it normal, also tried with dofferent global admin accounts but get the same, so im just wondering if someone faced that issue before or not because im stuck on that issue and can't find any info on the internet related.<br />
<br />
Thanks.
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Hello Experts, 

Im facing an issue when trying to check the user email acticity or any Office 365 service from usage tab, all users display name are encripted with numbera & letters like that  djcbxnx28284nznz and not the normal way which is email. I tried different tenant to just confirm if the issue from Microsoft side or not but actually found it normal, also tried with dofferent global admin accounts but get the same, so im just wondering if someone faced that issue before or not because im stuck on that issue and can't find any info on the internet related.

Thanks.

Users Email Usage Activity Issue

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.