Thanks for the info. The error shows missing library dependancy but I suspect that there are two libraries with some similar #includes. 

When it is not clear which libraray to use there is best guess and we probably need to look again at what arduino does these days. for example

lib1/ArduinoOTA.h
lib2/ArduinoOTA.h

where there is an #include <ArduinoOTA.h> in the code.

That example isn't entirely right but gives the gist of the issue.

In short, the error you see is that the ArduinoOTA.h can't be resolved and it is needed by the EspMQTTClient that you are using.

Try adding the #include below the #include <EspMQTTClient.h> in the .ino

Add this line to your ino code ...

#include <ArduinoOTA.h>

That is a short answer that might or might not work. 

If you can post or email your .ino code so that we can see your #includes that will allow us to fix the issue. 

Great we will take a look. 

btw: The Configuration names on the tool bar are not related to an arduino build, they manly affect intellisense. However the word "debug" appearing in a configuration name can cause the automatic debugger to be enabled.

We tried the Microsoft example and it compiled okay for us.

Looking at your build output it seems to have discovered other libraries with similar .h names. Not the the one srecommended by microsoft.

If the same code works in the arduino ide then this suggests a different configuration in visual micro than arduino ide. Can you please switch on file>preferences>verbose in th arduino ide. Then build and post the output as txt file. 

Thanks