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We are using the Domain Mapping Plugin on a large WP Multisite. We have checked the option to use the subdomain.multisiteplatformdomain.com for log in and admin features (we do this so we can use https) the challenge comes when "Previewing" a post - because the preview link goes to mappeddomain.com not subdomain.multisiteplatformdomain.com and of course the user is not logged in on mapped domain so it throws an error that you do not have permission to preview this post