The solution was related to another post I made earlier about multi-root workspaces. Once I had that figured out, PlatformIO activated and all was well.
Open a new window (File -> New Window) , and add the Sensor Hub and Gateway folders separately the workspace (File -> Add Folder to Workspace for each). This will now be a multi-root workspace, and as far as PlatformIO is concerned, two separate project folders. Save the workspace (File -> Save Workspace As) if you want to be able to save the configuration to a file so you can re-open it at a later date. Workspace can also store other configuration into such as installed plugins, editor settings…
And you are right, it is monitor_flags
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