The ERR_CONTENT_DECODING_FAILED implies that the audio encoding doesn’t match the file type. For example, it’s possible to give an .ogg file the .mp3 file extension, and this will usually prevent the file from playing.
Additionally, there may be other issues if an extension or a different module are interrupting the decoding or playing steps.
@majora2186 I’d recommend testing with a different browser (eg. Chrome if you usually use Firefox, for example), and if you’re using Chrome make sure that you try enabling the Forge: More Awesomeness module which is automatically added to the game if you’re running on Forge.
Also make sure that your audio assets follow the guidelines specified by Media Optimization Guide | Foundry Virtual Tabletop
Hope this helps!