I got a weird Tuner Unavailable twice for TNT but then the web interface still showing that it was remuxing. Third time was the charm and it worked good, but wanted to put the logs here just in case they help.
2020/08/06 19:43:12.849814 [TVE] action=auth mvpd=Comcast_SSO requestor=TNT
2020/08/06 19:43:13.319605 [TVE] action=navigate url=https://sp.auth.adobe.com/adobe-services/authenticate/saml?noflash=true&mso_id=Comcast_SSO&requestor_id=TNT&no_iframe=true&domain_name=adobe.com&redirect_url=https%3A%2F%2Fsp.auth.adobe.com%2Fadobe-services%2FcompletePassiveAuthentication
2020/08/06 19:43:13.320177 [TVE] action=request type=Document method=GET url=https://sp.auth.adobe.com/adobe-services/authenticate/saml
2020/08/06 19:43:13.533033 [TVE] action=request type=Document method=GET url=https://oauth.xfinity.com/oauth/authorize
2020/08/06 19:43:14.047157 [TVE] action=request type=Document method=GET url=https://login.xfinity.com/login
2020/08/06 19:43:14.047169 [TVE] action=auth_domain domain=login.xfinity.com
2020/08/06 19:43:14.563671 [TVE] action=wait_for_page
2020/08/06 19:43:14.588327 [TVE] action=error_response type=Script error=net::ERR_CERT_AUTHORITY_INVALID
2020/08/06 19:43:14.617511 [TVE] action=error_response type=Script error=net::ERR_CERT_AUTHORITY_INVALID
2020/08/06 19:43:14.955459 [TVE] action=error_response type=Document error=net::ERR_CERT_AUTHORITY_INVALID
2020/08/06 19:43:20.357173 [TVE] action=page_ready
2020/08/06 19:43:20.357190 [TVE] action=wait_for_page done=true reason=page_ready
2020/08/06 19:43:20.357196 [TVE] action=fill_form [email protected]
2020/08/06 19:43:20.430115 [TVE] action=wait_for_auth
2020/08/06 19:43:20.433647 [TVE] action=request type=Document method=POST url=https://login.xfinity.com/login
2020/08/06 19:43:21.013988 [TVE] action=request type=Document method=GET url=https://oauth.xfinity.com/oauth/authorize
2020/08/06 19:43:21.083488 [TVE] action=request type=Document method=GET url=https://sp.auth.adobe.com/adobe-services/oauth2
2020/08/06 19:43:21.861390 [TVE] action=request type=Document method=GET url=https://sp.auth.adobe.com/adobe-services/completePassiveAuthentication
2020/08/06 19:43:21.861402 [TVE] action=authed
2020/08/06 19:43:21.862440 [TVE] action=cookies num_domains=2 num_cookies=14
2020/08/06 19:43:21.863312 [TVE] action=error_response type=Document error=net::ERR_ABORTED
2020/08/06 19:43:23.063708 [TVE] stream timestamps: tnt: start_at=2020-08-06T19:33:10-04:00 current_at=2020-08-06T19:42:51-04:00 end_at=2020-08-06T19:43:03-04:00
2020/08/06 19:43:23.063727 [TNR] Opened connection to TVE-Comcast_SSO for ch6035 TNT
2020/08/06 19:43:23.064679 [HLS] Starting transcoder for channel 6035 from 69.150.103.51 (encoder=remux, resolution=, deinterlacer=, bitrate=6460)
2020/08/06 19:43:23.343546 [HLS] Probed live stream in 278.660996ms: h264 1280x720 progressive 5499524bps
2020/08/06 19:43:28.033164 [HLS] Stopping transcoder session ch6035-dANY-9dbbf6b53e34 (out: 0s, finished: false)
2020/08/06 19:43:28.035850 [TNR] Closed connection to TVE-Comcast_SSO for ch6035 TNT
2020/08/06 19:43:30.595409 [TVE] stream timestamps: tntp: start_at=2020-08-06T19:33:13-04:00 current_at=2020-08-06T19:42:54-04:00 end_at=2020-08-06T19:43:06-04:00
2020/08/06 19:43:30.595426 [TNR] Opened connection to TVE-Comcast_SSO for ch6036 TNTP
2020/08/06 19:43:30.596272 [HLS] Starting transcoder for channel 6036 from 69.150.103.51 (encoder=remux, resolution=, deinterlacer=, bitrate=6460)
2020/08/06 19:43:33.674583 [HLS] Probe failed for live stream after 3.078077335s and 0 bytes
2020/08/06 19:44:02.128865 [HLS] Stopping inactive session ch6036-dANY-9dbbf6b53e34
2020/08/06 19:44:02.128882 [HLS] Stopping transcoder session ch6036-dANY-9dbbf6b53e34 (out: 42.017878s, finished: false)
2020/08/06 19:44:02.133837 [TNR] Closed connection to TVE-Comcast_SSO for ch6036 TNTP
2020/08/06 19:45:20.313498 [TVE] stream timestamps: tntp: start_at=2020-08-06T19:35:11-04:00 current_at=2020-08-06T19:44:48-04:00 end_at=2020-08-06T19:45:00-04:00
2020/08/06 19:45:20.313516 [TNR] Opened connection to TVE-Comcast_SSO for ch6036 TNTP
2020/08/06 19:45:20.314223 [HLS] Starting transcoder for channel 6036 from 69.150.103.51 (encoder=remux, resolution=, deinterlacer=, bitrate=6460)
2020/08/06 19:45:20.827086 [HLS] Probed live stream in 512.620317ms: h264 1280x720 progressive 5303112bps
2020/08/06 19:45:20.852911 [HLS] Session ch6036-dANY-9dbbf6b53e34 started in 737.866155ms