Starting LoRa failed


I want to perform peer to peer communication between two Arduino MKR WAN 1310. I tried to use the LoRa.h library of sandeepmistry (v 0.6.1) and the example "dumpmodemlorasender" of the MKRWAN.h library, but without success. I always get the message "starting LoRa failed" in the Serial Monitor.

With the Arduino MKR WAN 1300 this still worked according to forum contributions. Please help me.

Best regards