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Always get this error during device token validation. Are there any ideas why it's happening? Here is the snipped of the code below I use for JWT generation. import time import jwt private_key = """-----BEGIN PRIVATE KEY----- mykey -----END PRIVATE KEY-----""" data = { "iss": "my_team_id", "iat": int(time.time()), } headers = { "kid": "my_key_id", } jwt_token = jwt.encode( payload=data, key=private_key, algorithm="ES256", headers=headers ) print(jwt_token)