ESP32 ESP-NOW Master-Slave: Slave not found

Other Hardware 3rd Party Boards
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Hi, I'm starting to test ESP-NOW in two ESP32 boards with a basic Master-Slave connection. I uploaded the ESP_Now_Basic_Master example code to one of the boards and the ESPNow_Basic_Slave example to the other.

Problem
The Master device cannot find the Slave device. I set the constant PRINTSCANRESULTS to 1 and the Slave device doesn't appear in the Serial Monitor messages.

Extra Info

  • ESP module used: ESP-WROOM-32.
  • Power supply: Master device is powered by the Micro USB connected to my computer and the Slave device is connected to a 5V-1A DC power supply.
  • Both devices initialize ESP-NOW effectively.
  • I have also tried hardcoding the Slave MAC address into the Master program, but that didn't work.
  • Both devices have the same Wi-Fi channel.
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