Hello,
My post here: https://social.technet.microsoft.com/Forums/en-US/7f7da752-8c4b-4f64-94a6-42b58991f247/cookie-for-domain-not-being-used-for-subdomains?forum=winserver8gen
Was marked as spam, I guess because I had improper formatting (attempted to use markdown instead of WYSIWYG), but it's now fixed.
Could you un-spam it?