I found the problem , it is the display name in AD
Modify User Initials for Outlook and Office 365

Hi ,
I'm running Office 365 2008 Semi , I see in Outlook user initials are shown as their picture which is fine but I'd like o change the order of these initials so instead of :
Last Name, First Name SJ
to be
FirstName, Last Name JS
I see that I can push a registry key to show initials but I don't know how to specify the order of the initials. please advice.
HKEY_Current_User\Software\Microsoft\Office\Common\UserInfo.
2 answers
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Emily Hua-MSFT 26,841 Reputation points Microsoft Vendor
2021-03-09T11:15:21.507+00:00 @Bonus12
Do you want to change the order of initials shown on emails?
I would suggest you go to File > Options > General > Initials, set the initials that you want.
Then you would find the initials on emails as you set.
But if you want to change the order for initials on other MS 365 apps, such as Word, Excel, it seems to be impossible currently.
Here is the similar thread, "Change of initials in Office 365", you may have a look.The following image shows the initials on Word which uses another order, but the account is same.
The image below shows the profile is set for this Microsoft account.
If you have other questions, please post back.
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