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do not know why or how this worked .. but it did ... so might be worth a try ..

I have SPMC on my firetv. I had tried making this plugin work on SPMC and then later on separate  installs of kodi on firetv and none of those worked for llive TV and all of those had worked for archive TV.

Yesterday I tried a new combination ..
Kodi 17.6 for my fireTV V1 and the plugin zipped from the github. https://github.com/maxgalbu/xbmc.plugin.video.nba

And as luck would have it, this worked for live tv and archived games. So i immediately stopped the plugin from updating itself, do not plan on doing anything with this kodi install. Its dedicated for nba league pass.

That’s working for me, both on a fresh install of Kodi 17.6 on an Android tablet and on Kodi 16.1 on a generic Android TV box on which I have a lot of other addons installed.  However it did not work for me on Kodi 16.1 on Windows.  All that I did was install the version of the NBA addon from the xbmc.plugin.video.nba-master.zip file at the web page that you provided a link to,  set the resolution to 720p, and then both live and archived games started playing normally.  For the convenience for others, the direct link to that zip file is here:
https://github.com/maxgalbu/xbmc.plugin....master.zip

This is very good; I definitely will continue to subscribe to NBA League Pass now.  Thanks for the tip.