Thanks for that info and assurance, @BubbaBlitz7348.
@Aeluwas. I have checked twice with Charter’s Spectrum cable service 1/2 year apart. I have 3 Harman-Kardon Invokes and Microsoft with Harman converted all such devices to pure BT speakers when Cortana was retired as a general standalone, general purpose speaker device. Must have been the only person in the world but I couldn’t get the OTA firmware update that would flash my devices overnight to pure BT speaker status (but at the suggestion of Harman support, it worked right away via a cellular data connection with the Invokes connected to my smartphone as a mobile hotspot!). Back then it occurred to me that perhaps failure of the OTA updates via cable might somehow be an IPv6 connectivity problem but the Spectrum support person said then that they provide IPv6 connectivity as did another Spectrum support person avowed in the early AM today when I inquired again if there was anything wrong in Spectrum’s IPv6 functionality. Thanks for your great help and advice. I also have a factory-fresh Netgear router from 2014 never used - warranty replaced previous failed Netgear - that has IPv6 support and my neighbor, who is a super medical records database geek, shares the same Spectrum cable box with me so I’ll try swapping out the router and asking the neighbor if he also lacks IPv6 connectivity to further see what’s transpiring. Just a challenging puzzle to solve!