That's correct. If you are using the "Desktop background picture URL (Desktop only)" setting available in the Device restrictions template, it applies specifically to Windows 10/11 Enterprise and Windows 10/11 Education.
If you need to set the desktop wallpaper using Intune for other editions or prefer an alternate method, you can consider using a PowerShell script. I am currently working on and testing a script for this purpose, and I will share it with you once it's ready.
In the meantime, as a workaround, you could set the registry key, HKEY_CURRENT_USER\Control Panel\Desktop
and on the right-hand side, you will find an entry called "Wallpaper". Update that to the wallpaper file location.
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