We found out that our skills work when using the dot; however, they fail when using the Amazon Alexa test tool. With the test tool, we get the message "The remote endpoint could not be called, or the response it returned was invalid."
This is happening in two separated accounts with all the skills we have there.
Do anyone knows the root cause?
I already sent a message to support but I didn't get any confirmation that they are aware of the problem.