Windows 11 26H2 OOBE "User folder name" - Intune/MDM policy configuration

Hello,

Windows 11 26H2 introduces a new User folder name option during OOBE, under the advanced options on the Name your device screen.

The OOBE UI states:

“If you set up this PC with a work or school account, we'll use your organization's policies to set the folder name instead.”

I'm trying to determine which organizational policy this refers to.

I tested this on Windows 11 26H2 build 26300.9457 using Windows Autopilot Device Preparation and Microsoft Entra ID join.

For example, with an Entra ID user:

alland @contoso.com

and without manually specifying the User folder name during OOBE, Windows creates the profile using the user's name rather than the UPN prefix, for example:

C:\Users\AllanDeyoung

The desired behavior would be for the folder name to be dynamically derived from the Microsoft Entra ID user's UPN prefix, like this:

alland @contoso.com -> C:\Users\alland

I checked Windows Autopilot Device Preparation, the traditional Windows Autopilot deployment profile, and Intune Settings Catalog, but I couldn't find a setting corresponding to this new OOBE option on my Contoso test tenant or any production tenant.

Which "organization policy" is the new Windows 11 26H2 OOBE User folder name option referring to?

Is there currently a documented policy or setting that controls this value?

Thanks!