ESP8266 Node MCU 12-E not reconnecting to Arduino IoT Cloud after switching from micro USB power (via desktop USB port) to 5V via the VIN pin (AC adapter through MB V2). :
Introduction- ESP8266-NodeMCU Module
Help powering nodeMCU through VIN : r/esp8266
ESP8266 NodeMcu Pinout - ESP8266 Shop
NodeMCU ESP8266: Details and Pinout : 11 Steps - Instructables
ESP8266 NodeMCU Tutorial
ESP8266 – Knowing the NodeMCU GPIOs or Pinout - The Engineering Projects
ESP8266 NodeMCU pinout for Arduino IDE - Mechatronics Blog