How to Set Up Point-to-Point Communication Between Two LoRa-E5 Mini Modules?

Products & Technology LoRa
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  1. Are you using STM32CubeProgrammer to upload your sketches?
  2. Is your serial monitor an ArduinoIDE with USB connection?
  3. Is the ST-Link a genuine ST-Link? Is it a Chinese clone?

Without knowing the details of your setup, I am clueless.