Sorry to heard that, If you are seeing any existing audio broken case, let me know the assetId and universeId and I can help to check our DB.
“This occurs with audio not owned by the creator” - that might be expected if owner had not explicit sharing the permission of the audio before.
“audio owned by the creator.” - most common way for the permission granting is when creator explicit drag the audio to the experience in studio, if this action never happens, then creator will need explicit allow/sharing the audio to the experience.
In the mean time, we know there is some limitations around group owned asset permission sharing issue, and we are working on some improvement and hopefully it can shipped Q1 2024, as mentioned here New Asset Privacy and Permissions Features for Audio and Video