Live TV not tuning to one channel on certain devices

Having issues tuning into ABC on multiple clients. Every single other channel works fine (including 31.2-31.4), but 31.1 will never start playing on the Xbox (our primary Plex client, hooked up to the living room TV) or on browser. It works fine when tuning in via iPhone app and via the Plex desktop app (Windows).

Does anyone have any experience with an issue like this? My initial thought was that the Xbox One app was out of date/deprecated/no-longer-supported, but it doesn’t work in browser either.

Server Version#: 1.23.3.4707 (Unraid Docker)
Player Version#: Xbox One (Player Version 5.24.1) and browser (Firefox 92.0)
Tuner Make/Model: HDHomerun Connect Duo
Guide/Lineup name: ?
Using XMLTV?: ?
Channel number/Name: 31.1 ABC

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