Unable to tune any ATSC 3.0 channels

Server Version#: 1.32.5.7328
Player Version#: 1.74.1.3913-9baac009
Tuner Make/Model: HDHomeRun FLEX 4K (Model: HDFX-4K)
Guide/Lineup name: Local Broadcast Listings (Baltimore, MD)
Using XMLTV?: No
Channel number/Name: 122.1

I am not able to tune any of the ATSC 3.0 channels in my area through Plex on any Plex client. When I try to watch them live or record them it says “Could not tune channel. Please check your tuner or antenna.”

I realize that the sound will not work on ATSC 3.0 channels due to the AC-4 audio but I was expecting to at least be able to get the video. I know that the channels I have been trying do not have DRM enabled.

This is what shows up in the log file each time:

[Req#88a/Grabber/5fc76c777dc1e8002d48a87c-5fc705eba62668002dcefa94-gt68t6s032pqskkiiypsxcm8] Recorder: Unable to create transcode session or session failed to start.
[Req#88a/Grabber/5fc76c777dc1e8002d48a87c-5fc705eba62668002dcefa94-gt68t6s032pqskkiiypsxcm8] Recorder: Error 16 (Recording failed. Please check your tuner or antenna.) starting the record, shutting things down.
[Req#88a] Subscription: Rolling media grab failed to start.
[Req#88a/Grabber/5fc76c777dc1e8002d48a87c-5fc705eba62668002dcefa94-gt68t6s032pqskkiiypsxcm8] Starting media grab failed.
[Req#88a/Grabber/5fc76c777dc1e8002d48a87c-5fc705eba62668002dcefa94-gt68t6s032pqskkiiypsxcm8] Unknown metadata type:
[Req#88a/Grabber/5fc76c777dc1e8002d48a87c-5fc705eba62668002dcefa94-gt68t6s032pqskkiiypsxcm8] Failed to start session.
[Req#8d6/Transcode/746be0b1-c023-432f-8c17-0209dc9b324c/1a43b05a-40ca-467c-a9ca-5a959e9bf648] http://10.0.0.79:5004/auto/v122.1: Server returned 5XX Server Error reply
[Req#88a/Grabber/5fc76c777dc1e8002d48a87c-5fc705eba62668002dcefa94-gt68t6s032pqskkiiypsxcm8] Unable to find title for item of type 5
[Req#88a/Grabber/5fc76c777dc1e8002d48a87c-5fc705eba62668002dcefa94-gt68t6s032pqskkiiypsxcm8] Unable to find title for item of type 5

When I use a browser and go to the the URL mentioned in the log file, I am able to download a video file that is playable in VLC (with no audio).

Since the ATSC 3.0 channels are not listed in the guide anywhere, I just have them mapped to the ATSC 1.0 version of the channel (22.1 instead of 122.1 in this case).

The ATSC 3.0 channels are playable in the HDHomeRun app with no issues. I just can’t seem to get them to work in Plex. What am I missing here?

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