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The description of available serial ports on the Arduino Micro board on Reference>Serial is wrong.
Pins 0(RX) & 1(TX) are accessible by 'Serial1' not by 'Serial'.
I used 'Serial1' (instead of 'Serial') to talk to an external display controller (connected to pins 0 & 1) with Arduino IDE 1.8.9 and it started working.
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