I used MDT from a long time.
I build my windows 10 image with an english iso, I add the french langage pack in the CustomSettings.ini and in my task sequence I add packages in the preinstall step, like Microsoft-Windows-Notepad-FoD-Package fr-FR amd64 10.0.19041.1
And using this system image to deploy a new computer works fine.
I get my windows in french and my notepad in french too.
But If I used the same process to build my Windows 11 system image and deploy a new computer with it, I get my windows in frech but my notepad is in English
Calcultor, Paint, Tips, too !
No Internet access during system image building as learned.
Poor Internet access for my new computer.
Thank you for your help.