The IP-HTTPS route does not have published property enabled.
netsh interface ipv6 add route fd72:c126:3978:3333::1/64 IPHTTPSInterface publish=yes
Which has come back ok, but makes no difference. Also tried uninstalling the interface and re-enabling as suggested but has no effect.
Route advertisement is disabled on the IP-HTTPS adapter. This is required for DirectAccess to work as expected.
Enable forwarding on the IP-HTTPS adapter.
There is no response from the network location server URL. DirectAccess connectivity might not work as expected, andDirectAccess clients located inside the corporate network might not be able to reach internal resources.
Seems to be next to no documentation I can find for these issues either.