Among the numerous incompatibilities and troubles we are seeing with the rollout of IPv6 is a new hitch.  It seems Microsoft just opened up a ticket with themselves over a problem they are having with their Azure Active Directory cloud-based ID system; it would seem it is incompatible with IPv6.  The Register specifies Windows 10 for this issue however it is very likely that previous versions are also going to encounter issues.  You can read more about the troubles and attempted solutions here.

"According to Redmond's principal network engineer Marcus Keane, the software giant is struggling to move over to the decade-old networking technology due to a DHCPv6 bug in Windows 10, which made it "impossible" to expand its planned corporate network."

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