Blynk App. showing device offline on local server (nodeMCU-ESP8266)

Generally that is sufficient for USB link… but as it is still not connecting. you may need other changes in your Local Server…

First, confirm it is actually running :stuck_out_tongue_winking_eye:

Then read through this and do whatever you haven’t already done…

Also make sure you don’t have the IDEs Serial Monitor up or something else like that interfering with COM3