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It won’t work that way. The cable box only outputs one or so channel at a time. You have to connect the cable box to the TV (usually HDMI is best), switch the tv input to the input you connected the cable box, and then control the channels using the cable box.
You can use the spectrum app as some suggested.
Also as a backup and to watch some bad old TV shows that on secondary channels you can hook up an antenna to the coax, set as over the air and scan for local channels.
I did what is in your first paragraph.