Never mind on my previous ask ... I figured out that I was hitting the availability issue reported by this article.  I went back and requested an older version and it was successfully created.  I am now upgrading it to the latest.

I've been getting these messages but I actively used my instance.  I decided to try releasing it and requesting a new instance, but every request for the last 2 days has resulted in the following message: 'We were unable to assign an instance to you....