And you didn’t mention if you are using a Local Server or the Cloud… your code is configured to a Local Server. Is this you code or copied from some example? If yours, are you sure your server is online? Is the App set to connect to the same server?
Blynk.begin() is a blocking command. That means there is no further code processing done until it connects to the server… thus no sensor reading.
Fix the connection and how you read the data (use a timed function, not in the main loop) and you should see some results.
