FUOTA server, Python example

Hello.
I started the fuota server, I try to use examples in Python - Python examples - ChirpStack open-source LoRaWAN<sup>®</sup> Network Server
But when I start, I get an error message:

Blockquote
root@galm-VirtualBox:~/grpc/examples/python/helloworld# python lora_test.py
Traceback (most recent call last):
File “lora_test.py”, line 35, in
resp = client.Enqueue(req, metadata=auth_token)
File “/usr/local/lib/python3.6/dist-packages/grpc/_channel.py”, line 946, in call
return _end_unary_response_blocking(state, call, False, None)
File “/usr/local/lib/python3.6/dist-packages/grpc/_channel.py”, line 849, in _end_unary_response_blocking
raise _InactiveRpcError(state)
grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
status = StatusCode.UNAUTHENTICATED
details = “authentication failed: jwt parse error: token contains an invalid number of segments”
debug_error_string = “{“created”:”@1621540129.794485548",“description”:“Error received from peer ipv6:[::1]:8080”,“file”:“src/core/lib/surface/call.cc”,“file_line”:1067,“grpc_message”:“authentication failed: jwt parse error: token contains an invalid number of segments”,“grpc_status”:16}"

Help please, what could be the problem?

It looks like an issue with the API key which is invalid.