Hello everyone!
The solution to this problem.
I adapted this video to my situation.
OTAA based LoRaWAN End Node with Arduino Nano & RFM95
I modified the lorabase.h file in the “C:\Users\User\Documents\Arduino\arduino-lmic-master\src\lmic” folder.
An uncomment the " # Extra channel configuration." in the chirpstack-network-server.toml