ipv4v6xlat em7455

I have an em7455 on T-Mobile USA. T-Mobile is ipv6. I would like to use ipv4-only app such as spotify desktop. Spotify Desktop currently fails as it thinks I am offline even though I am not. It is a known issue that this app does not support ipv6 as of this writing.

There is in the latest windows 10 x64 1709 fall creators edition support for ipv6 transition technology CLAT or 464XLAT. How do I enable this? My measure of success is being able to ping while on TMobile WWAN. What should I see in the routing table as evidence that 464XLAT is active? I assume both ipv4 and ipv6 should be enabled on the cellular network interface.