LMIC + RFM9x+Seeed XIAO BLE

Hi,
I need a help on LMIC Library of LoRaWAN with the XIAO BLE & adafriut RFM9x .

I am facing the following issues
1. There is a blue LED blinking every second in XIAO BLE
2. Downlink data failed (Gateway sent but XIAO didn’t receive)

Kindly share your experience.