
@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.
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