NBA TV is no longer working on Channels DVR for TVE. I believe NBA TV has changed their streaming provider and Channels needs to be updated to work again.
Could not start stream for TVE-DTV ch6194 NBATV: TVE: get: https://nbatv.akamaized.net/hls/live/621994-b/east/slate/VIDEO_5_1464000.m3u8?hdntl=exp=1608095291~acl=%2Fhls%2Flive%2F621994%2Feast%2F*!%2Fhls%2Flive%2F621994-b%2Feast%2F*~hmac=d8217c34067ea863d6dd1fc997255e78e9ea2d9a70b160efc1c1108995f2c8d1: 404 Not Found
https://www.nba.com/watch/nba-tv.
The new streaming provider is https://www.endeavorstreaming.com/
The new link is https://neulionms-a.akamaihd.net/nbad/player/v1/nba/legacy/styles/chromecast.css