Login to selected subscription using PowerShell.
run following command to register:
Register-AzureRmProviderFeature -FeatureName ManagedResourcesMove -ProviderNamespace Microsoft.Compute
to get register status:
Get-AzureRmProviderFeature -FeatureName ManagedResourcesMove -ProviderNamespace Microsoft.Compute
would take a while, afterwards register MS Compute resource provider:
Register-AzureRmResourceProvider -ProviderNamespace Microsoft.Compute