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Hi. It seems you are using GGv1. Please be aware that GGv1 is now in maintenance mode and GGv2 is recommended for any new development. Please consider to follow this tutorial instead: https://docs.aws.amazon.com/greengrass/v2/developerguide/client-devices-tutorial.html
That said, the BasicDiscovery.py script in the Python V1 SDK should perform Greengrass discovery and retrieve the GGv1 group CA (https://github.com/aws/aws-iot-device-sdk-python/blob/master/samples/greengrass/basicDiscovery.py#L106). It should then use the group CA to connect to the GGv1 core (https://github.com/aws/aws-iot-device-sdk-python/blob/master/samples/greengrass/basicDiscovery.py#L150). But it looks like it's finding and using the wrong group CA.
