Given that calling IMeetingAudioControllerDotNetWrap.UnMuteAudio(0) is invalid in SDK 5.x (as far as I know), please could we have a wrapper for the AskAllToUnmute method?
I will forward this to the team to implement. However, the C# wrapper is not actively managed by Zoom, so a timeline is unknown. However, if you need this interface sooner, you can manually add it to the wrapper. Here is an example of how to do this: Customized UI C# callback.