Hi my device is also showing offline , key is correct only ,what is the real issue , is some thing wrong i am doing in code ?
I’ve moved your post to a topic of its own, as it has nothing at all to do with the three year old topic that you posted in.
Please provide more details about your hardware and the code you’re using.
Hardware used : Ardunio uno with Esp 8266
blynk version seeing on serial port :V0.6.1 on Arduino Uno
connected to wifi successfully .
App using on Android
code is generated from Blynk example browser SSID and password only added later.
Please post the code you are using, and your serial monitor output.