to be clear, are you saying that both intellisense and the cloud compiler show errors when you DO NOT include #include "Particle.h" ?
i’m trying to understand where the problem lies: with our intellisense configuration or elsewhere. if it’s just an intellisense issue, you’ll see items in the “problems” tab (“View > Problems” from the main vscode menu) but your application will compile fine.
also if you can, please run the Particle: Audit Environment command (as shown here: Information: How to report bugs and provide feedback) and either PM me the results or share them here if they do not include sensitive info.