Hotspot Question
Your network contains an Active Directory domain named contoso.com. The domain contains a
member server named Server1 that runs Windows Server 2016. You install IP Address
Management (IPAM) on Server1. You select the automatic provisioning method, and then you
specify a prefix of IPAM. You need to configure the environment for automatic IPAM provisioning.
Which cmdlet should you run? (To answer, select the appropriate options in the answer area.)
Answer: 
This whole question is incorrect.
Since -GPOPrefixName must be identical as the name in the Wizard, which is IPAM and not IPAM1.
“You install IP Address
Management (IPAM) on Server1. You select the automatic provisioning method, and then you
specify a prefix of IPAM.”
So the value IPAM1 is always incorrect.
see: https://technet.microsoft.com/en-us/library/jj878306(v=ws.11)
https://docs.microsoft.com/en-us/powershell/module/ipamserver/invoke-ipamgpoprovisioning?view=win10-ps
Example 1: Provision GPOs
PowerShell
Copy
PS C:\> Invoke-IpamGpoProvisioning -Domain “child.contoso.com” -GpoPrefixName “IPAM1” -Force