LoRa Cover (915MHz) with ESP32 - Receiver Code not working

I have 2 DFrobot Firebeetle 915Mhz Lora modules and 2 DFrobot Firebeetle ESP32 MCU's. I loaded the DFrobot examples from here https://wiki.dfrobot.com/FireBeetle_Covers-LoRa_Radio_915MHz_SKU_TEL0122

I can see that the transmitter is sending packets, but the receiver only shows 'Receiver Test' in the serial monitor. Hardware is OK since if I load the sender to the other unit, it looks like it's sending packets OK…

Any assistance in getting these devices to work would be appreciated.