I think I have solved the problem. I was using the desktop client for my MacBook. I logged in on the website client, deleted the Alexa channel, saved the channel, and then updated my endpoint URL. The seemed to work, so I am thinking it may have been a problem with the integrated copy button, or a problem with the desktop clients generation of the endpoint URL. Either way, my skill does still have a problem with receiving the feedback in the amount of time that the skill requires. I.E. Flows that have a lot of intents take more time to process. I have an intent with over 70 unique recognized iterations.