Let's focus on one channel you have in "Favs", with this channel-id:
"US MGM+ DRIVE-IN"
And, this current airing info:
{"Airings":[{"Source":"xmltv:IPTVBoss","Channel":"127123","Time":1743784500,"Duration":6900,"Title":"Wonder Boys","EpisodeTitle":"Movie (2000)","Summary":"Movie (2000) Grady (Michael Douglas) is a 50-ish English professor who hasn't had a thing published in years -- not since he wrote his award winning Great American Novel 7 years ago. This weekend proves even worse than he could imagine as he finds himself reeling from one misadventure to another in the company of a new wonder boy author.","Image":"https://zap2it.tmsimg.com/assets/p24840_p_v10_ar.jpg","SeriesID":"Wonder Boys","ProgramID":"Wonder Boys/Movie (2000)","SearchScore":0.09372028248709982,"Raw":{"xmltv":"\u003ctv source-info-name="IPTVBoss"\u003e\n\u003cchannel id="MGM+DriveIn.us1"\u003e\n \u003cdisplay-name\u003eUS MGM+ DRIVE-IN\u003c/display-name\u003e\n \u003cdisplay-name\u003eUS MGM+ DRIVE-IN\u003c/display-name\u003e\n \u003cicon src="https://cdn.iptvboss.pro/logos/USA/MGM%2BDriveIn.us.png"\u003e\u003c/icon\u003e\n \t\u003clcn\u003e127123\u003c/lcn\u003e\n\u003c/channel\u003e\n\n\u003cprogramme start="20250404163500 +0000" stop="20250404183000 +0000" channel="MGM+DriveIn.us1"\u003e\n \u003cdesc lang="en"\u003eMovie (2000) Grady (Michael Douglas) is a 50-ish English professor who hasn't had a thing published in years -- not since he wrote his award winning Great American Novel 7 years ago. This weekend proves even worse than he could imagine as he finds himself reeling from one misadventure to another in the company of a new wonder boy author.\u003c/desc\u003e\n \u003cepisode-num system="dd_progid"\u003eMV00084664.0000\u003c/episode-num\u003e\n \u003cicon src="https://zap2it.tmsimg.com/assets/p24840_p_v10_ar.jpg"\u003e\u003c/icon\u003e\n \u003clength units="minutes"\u003e115\u003c/length\u003e\n \u003csub-title lang="en"\u003eMovie (2000)\u003c/sub-title\u003e\n \u003csubtitles type="teletext"\u003e\u003c/subtitles\u003e\n \u003ctitle lang="en"\u003eWonder Boys\u003c/title\u003e\n \u003c/programme\u003e\u003c/tv\u003e"}}],"Channel":{"CallSign":"US MGM+ DRIVE-IN","Categories":["US CA UK MOVIES"],"ChannelID":"US MGM+ DRIVE-IN","DeviceID":"M3U-EPGPROBSTSdirect","Genres":[],"HD":true,"Hidden":false,"Image":"https://cdn.iptvboss.pro/logos/USA/MGM%2BDriveIn.us.png","Name":"US MGM+ DRIVE-IN","Number":"127123","Station":"MGM+DriveIn.us1","Tags":[]}}
Piping that value through the jq statement I'm using, gives me this:
127123
So, back to some data from you. Using this URL:
http://$dvr/devices/ANY/channels
Can you post the M3U dataset for "GuideNumber":"127123"?