Ive been having this issue for a while now and its been driving me crazy. I just solved it I think. I went to extra, options, and then in the "metting" section towards the bottom is a "share computer sounds and music" box that was unchecked. I rechecked it and boom sound came back. This was after being on TV for hours at work and watching a show on a stream, TV closed because of the 3 hour limit and when I opened it again, no sound. This just fixed it for me.
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