1>Module.AudioMixerXAudio2.cpp.obj : error LNK2001: unresolved external symbol PKEY_AudioEndpoint_PhysicalSpeakers
1>Module.AudioMixerXAudio2.cpp.obj : error LNK2001: unresolved external symbol PKEY_AudioEngine_DeviceFormat
1>Module.AudioMixerXAudio2.cpp.obj : error LNK2001: unresolved external symbol PKEY_AudioEngine_OEMFormat
1>C:\Work\UnrealEngine-4.27.2-release\Engine\Binaries\Win64\UE4Editor-AudioMixerXAudio2.dll : fatal error LNK1120: 3 unresolved externals
Oh, what do you know, the Errors List panel was right! 
This is a really weird error, since these PKEY symbols are properties from the win32 API of Windows 
I guess… try deleting the Intermediate folder, uhm… make sure your Windows is updated, your audio drivers updated, check that your DirectX is up to date. I’m not sure, very weird one.