In the experimental section, I checked to use the networks from TVE. It pulled in guide data and works fine on the PC interface to view them (except Fox). But these channels 6000,1,3 do not show up in the guide on the FStick or Shield clients under ALL, or any other place. Fox 6002 does show up but I get a 400 bad request error. Fox does not work on the PC client either so it may be available at all. I tested on clients from my pi server and my shield server. Note that inside the client, on the Settings->Manage Sources->YouTube TV source, they do show up and I have even selected them as favorites. But they do not show up in the guide.
Logs from when viewing from PC
2020/12/27 11:53:00.978770 [ERR] Failed to start stream for ch6002: TVE: platform response: 400 Bad Request
2020/12/27 11:53:01.034235 [HLS] Couldn't generate stream playlist for ch6002-dANY-ip192.168.50.252: TVE: platform response: 400 Bad Request
2020/12/27 11:53:01.034361 [HLS] Stopping transcoder session ch6002-dANY-ip192.168.50.252
2020/12/27 11:53:10.998696 [TVE] stream timestamps: abc: start_at=2020-12-27T11:52:15-05:00 current_at=2020-12-27T11:52:36-05:00 end_at=2020-12-27T11:52:44-05:00
2020/12/27 11:53:10.998798 [TNR] Opened connection to TVE-YouTubeTV for ch6001 ABC
2020/12/27 11:53:11.001903 [HLS] Starting transcoder for channel 6001 from 192.168.50.252 (encoder=remux, resolution=, deinterlacer=, bitrate=3003)
2020/12/27 11:53:11.680709 [HLS] Probed live stream in 678.203125ms: h264 1280x720 progressive 2609189bps
2020/12/27 11:53:11.709148 [HLS] Session ch6001-dANY-ip192.168.50.252 started in 1.90530375s
2020/12/27 11:53:17.000846 [HLS] Stopping transcoder session ch6001-dANY-ip192.168.50.252 (out: 0s, finished: false)
2020/12/27 11:53:17.053329 [TNR] Closed connection to TVE-YouTubeTV for ch6001 ABC
2020/12/27 11:53:28.777544 [TNR] Opened connection to TVE-YouTubeTV for ch6000 NBC
2020/12/27 11:53:28.781091 [HLS] Starting transcoder for channel 6000 from 192.168.50.252 (encoder=remux, resolution=, deinterlacer=, bitrate=4200)
2020/12/27 11:53:29.197617 [HLS] ffmpeg: ch6000-dANY-ip192.168.50.252-remux: [hls @ 0x20dd4c4c00] Timestamps are unset in a packet for stream 1. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
2020/12/27 11:53:29.527642 [HLS] Probed live stream in 746.032813ms: h264 1920x1080 progressive 2468830bps
2020/12/27 11:53:29.552095 [HLS] Session ch6000-dANY-ip192.168.50.252 started in 1.306438489s
2020/12/27 11:53:35.805689 [HLS] Stopping transcoder session ch6000-dANY-ip192.168.50.252 (out: 22.622489s, finished: false)
2020/12/27 11:53:35.867661 [TNR] Closed connection to TVE-YouTubeTV for ch6000 NBC