Dear Maruf Mostafa
Unfortunately, as the incident is under investigation.
Under investigation this is a WINDOWS Spotligth server configuration issue that has been urgently fixed.
Normally the WINDOWS Spotligth function reads the region of the account and the region of the WINDOWS system to push the wallpaper, but apparently there was a problem with this function.
I'm SO SORRY.
Best Wish
Shawn Z | Microsoft Community Support Specialist