I had the same problem, air antenna was not recognized by Samsung 2020 smart tv but works ok with an older model. Before reset the TV to factory default, gave a 2nd thought, so I disconnected power cord for a few minutes and tried again. Still no help. I repeated that and waited for 2 hours before reconnect. This time I was able to see in setup/broadcast/auto scan. It picks up over 70 channels and also added a Live TV Air icon to the smarthub bar. I am able to change channel with Samsung remote control . Interestingly, after the last discovered air channel, Samsung TV channel will continue on. I think Samsung has to fix the bug that let many cord cutting people dealing with this difficulty.
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