ah, perhaps we can find a way to make these commands clearer
Particle: Set Target Platform - which type of hardware are you targeting (photon, electron, etc)?
Particle: Set Target Device - which specific device of yours will you be sending updates to?
Particle: Set Firmware Version - which version of the Device OS you’ll be compiling for?
sounds like you are like me and named your dev hardware the same as what we call platform - e.g. electron, etc.
try running Particle: Set Target Platform and recompiling from there 