Command bar - how switch back from Spotify to TV audio

It’s playing the TV and then I ask Alexa to play a song from Spotify, which it does. But I don’t know what the command is to get it to switch back to the HDMI/ARC connection to go back to playing the Tv audio. Tried “ play TV” and some other things but nothing works and I have to press TV 9n the remote. What is the Alexa command to switch back??

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