How do I set background to a device + restart it? (New user/student)

[Dannyxs]

I made a new user (trial Intune) -> logged into Azure Portal -> made a new user(second) in Azure Active Directory and set the premium licenses (trial) for both the main user, and the second one -> I downloaded "Company Portal" app to a laptop and logged in with the second user.

1.Restart
I went to Intune>Devices>"laptop", clicked on restart and the status after 30 seconds changed to "Complete" although it didn't restart the laptop. Why is that?

2.Background
picture I followed this website: https://blog.peterdahl.net/2018/11/18/apply-corporate-background-to-windows-10-pro-with-microsoft-in...

I applied the script on both all users and all devices, but nothing happened. Am I missing something? (picture: https://imgur.com/a/GFgKd9r )

[#2]

@Dannyxs What is the status of your device on Intune, does it shows as Azure AD Joined and status as Complaint?

Regarding wallpaper you could use the configuration profile