Ok, so ASUS have come back and they say IPv6 works with APP etc.
When you return home, I would advise you upgrade ZenWifi to latest stock version and then try again.
When/if you send feedback, can you put in comments box that you spoke with ‘UK Sentinel’ and can you use the same email as the one registered to this forum so with your consent, I can pass to ASUS your email address so they can find the feedback form quickly ?
My only concern is that in UK we use IPv6 /56 and others use /64 etc. so will be interesting 
Let us know how it goes and if you send feedback form etc ?
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Our xx team verified that the remote connection of app works fine when the IPv6 is enabled. Please inform the customer to send the feedback with logs for our analysis.
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In a completely sane world, madness is the only freedom (J.G.Ballard).
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