Why are you hard-coding the Auth token when you’re using the Edgent sketch? This is assigned dynamically when you provision the device.
You’ve deleted the board definitions, instead of un-commenting one of them, so the custom definition in Settings.h is being used instead.
This assigns GPIO4 (D2) as the LED pin, which is conflicting with your SDA pin.
You should read this…
although TBH, you’d probably be better not using Edgent.
You’d certainly ne better using a BlynkTimer rather than doing the millis comparison stuff in your void loop.
Pete.