Hi,
Thank you for all the detail.
Could I please grab your FMOD version? The issue sounds similar to the following: ERR_OUTPUT_INIT on Windows, 2.02.05, the issue should have been solved in 2.02.06
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A workaround is getting the users to disable all except their main driver: ERR_OUTPUT_INIT on Windows, 2.02.05 - #7 by talecrafter
This is hard to say as it depends on so many factors.
Once we confirm you Unity version, we can hopefully find a solution.