I am facing the exact same issue, cannot browse any web pages, but can ping computer on company networks with Unity Media.
Is there any workaround for this ?
If it helps anyone. What I ended up doing is going to https://support.microsoft.com/en-us/help/929852/guidance-for-configuring-ipv6-in-windows-for-advance... and then choosing the "Disable IPv6 on all tunnel interfaces". This seemed to work, and allows for IPv6 to still be priority.