I got in touch with Microsoft Support but they have informed they don't provide support for Insider Program.
My version of windows is 1803.
I logged into this morning and my audio isn't working.
I have tried the trouble shooting but it doesn't fix it. I have done, I have also done the
Nothing has been able to fix.
I have re-installed the realtek audio driver and nothing fixes that. Can you please help?
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Microsoft provided you the right answer. Insider releases are not stable and for use at your own risk.
However you could attempt is to reinstall drivers drivers with compatability settingshttps://support.microsoft.com/en-us/help/15078/windows-make-older-programs-compatible
If this does not help, I suggest to revert windows to a stable release, then your problems will be gone or if not - MS or Realtek support will be there to help.