It seems evident to me that the Zoom app has a dysfunctional relationship with Windows audio settings.This document provides an overview of how to test audio in Zoom. So, which of the two Zoom entries need to be adjusted? More to the point, why are there two Zoom entries? Even more to the point, how do I remove the bogus entry so that there is no question which Zoom entry needs to be adjusted? And even more to the point, how/why is it not possible in audio settings within the Zoom app itself to discover that Zoom sound is muted? Put another way, why is it necessary to navigate to the Windows App volume and device preferences window to discover that Zoom sound is muted?

When I scrolled to the bottom of the window, I saw: I opened Windows Settings via the gearbox icon on the left side of the Windows Start menu and chose System > Sound > Advanced sound options > App volume and device preferences.

It was not trivially obvious how to 'check the volume mixer'. I installed it without uninstalling anything and it went back to the previous version. I just installed the previous versions 5.6.6 and audio is now working again. Putting it here incase it helps others.save you some time looking for a solution that does not currently exist. It specifically says it intended fix this Audio problem for a subset of users. I just checked the Release Notes for this version 5.7.4(804) and it seems there was to be another release on 2nd Aug to fix this problem, which has been delayed. Haven't been able to use zoom in over a week on the laptop, which is an Omen 15! It's making things rather difficult since I do a lot of online trainings which are all scheduled on zoom. Getting the 'Failed to Detect Speaker error'. But there is no sound output to any device. Having the exact same problem, since the update.

Test zoom sound