Q:

Which field will be used to name the home folder?

We've got Office365 and AzureAD. 
One user is having some issues with his home folder.
Name: John Döe
Account: john.doe@mycompany.com
User signs in with his office365 account - john.doe@mycompany.com
First time he signs in to the device it creates a home folder C:\Users\johndöe
With some application and repositories that require to work from within his home folder they have issues with encoding the folder name. 
If I wish to ensure this doesn't happen in the future for more people. Where can I change the name of the user to ensure that the home folder is created without any special characters but still display his information correctly?
As in:
C:\Users\johndoe - john.doe@mycompany.com - Display name: John Döe
c:\Users\janedoe - jane.doe@mycompany.com - Display name: Jane Döe
Thanks in advance.
EDIT for some clarification: 
Office365 portal I can change "First name, Surname and Display name".
Should I change
First name: John
Surname: Döe
Display name: John Doe
Or: 
First name: John
Surname: Doe
Display name: John Döe

A:

I would have hoped to find a better solution to this. but this is how I did it. 
Changed my display name in office365 admin panel to John Doe instead of John Döe.
Created a fresh install of Windows and logged in as john.doe@mycompany.com which now created homefolder C:\Users\JohnDoe instead of C:\Users\JohnDöe.
After user is setup on the machine, I changed the Display Name back in Office 365 admin panel to John Döe to ensure everything is shown properly. 
Been using this now since I posted this question and haven't had any issues.

