@WadeAlsup my org hasn't delved too deeply into W10 devices in Meraki, however in my testing I observed:
-added profile first, installed agent second = 1 client appears in Systems Manager
-installing agent, then adding profile = duplicate entries
We're still using Active Directory to manage our PCs, so this hasn't been an urgent issue to resolve, however I would open a support ticket b/c all I could find in the documentation is what you mention.