No answer. I have to same issue but with a different setup.
Arduino Mega 2560 <> BD-LLC (Bi-Directional Logic Level Converter) <> eNUR-05WL2 (Nordic ID RFID reader)
So far, I only commented out SoftwareSerial and changed it to pins 19 & 18 and defines NurSerial as Serial1. Also changed baud rate to 115200.
Did you find an answer to your problem? I get stuck at not even detecting the NUR module.