Only Default Audio Track Works in Browser

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I know that Opus 7.1 will not transcode properly if the client is not compatible. A large issue there is that most vanilla devices (TV, phone, tablet) do not support 7.1. This triggers transcoding, which leads to media that seemingly doesn't play or plays without sound.

May not be the issue here, but worth checking if transcoding of audio is the culprit. A little more info on your setup as well as logs would be helpful.