Why does the upgrade of a Shared Distribution Point fail when I use the “Start-CMDistributionPointUpgrade” PowerShell cmdlet?

Why does the upgrade of a Shared Distribution Point fail when I use the “Start-CMDistributionPointUpgrade” PowerShell cmdlet?

I am trying to upgrade a shared Distribution Point (DP), to a ConfigMgr 2012 R2 DP using the
Start-CMDistributionPointUpgrade PowerShell cmdlet but it fails.

I’m seeing the following exception message:

Initiation of upgrade of BDP: server1.contoso.internal, failed.
Exception Type: System.Collections.Generic.KeyNotFoundException,Microsoft.ConfigurationManagement.Cmdlets.HS.Commands.StartDistributionPointUpgradeCommand :: Exception Message: System.Collect
ions.Generic.KeyNotFoundException: The given key was not present in the dictionary.
at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at Microsoft.ConfigurationManagement.Cmdlets.HS.Commands.StartDistributionPointUpgradeCommand.SetObjectProperties(IResultObject siteSystemObject, IResultObject distributionPointObject)
at Microsoft.ConfigurationManagement.Cmdlets.HS.Commands.StartDistributionPointUpgradeCommand.ProcessRecord()
at System.Management.Automation.CommandProcessor.ProcessRecord().