Core + alexa - server is unresponsive

Has anyone been able to get the Amazon Alexa integration working with core? I setup the alexa skill, it discovered all my devices/entities, but every device shows “server is unresponsive”.

Testing the integration to poll all my devices in the lambda setup works fine but once I’m in Alexa app, it always says that. My google fu has come up short on this one. Any ideas?