I know there are McAfee Maintained Lists for a lot of Microsoft's cloud offerings but I haven't seen one specifically for OneDrive. What you could possibly do is run a Rule Trace while a test machine of yours is trying to access OneDrive and after observing the results, maybe you can block the pages you see that need to be loaded for a successful connection. Maybe you could find some necessary resource that must be loaded and then look for that criteria and then have MWG send a block page whenever it sees said criteria.
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