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I have had something similar on the Answer when directing sound vai the say command to my Apple Tv and then back to the Built in output. I would have to run the command to switch back twice to get it back You could open Terminal.app and type and run say -a 38 "I am Back" a couple of times.
I've had this problem happen to me in the past. I have found that restarting my Mac tends to fix the problem. Try restarting your Mac.
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