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Private IP addresses are created with an IPv4 or IPv6 address. VMs cannot communicate between private IPv6 addresses on a Vnet, but can communicate inbound to a private IPv6 address from the internet when using an internet-facing load balancer.

From

Cover of Exam Ref 70-533 Implementing Microsoft Azure Infrastructure Solutions

Note

An internet facing load balancer is necessary for Vnets to communicate inbound with Private IP networks.