The page you are trying to access is not valid. Error on first attempt in Adobe Sign Mobile App

While in the Adobe Sign Mobile Application, 

and select "Send for Signature" 

and select "Documents"

and select a template from my Document Library

and enter my recipients email address

and enter a message

When I click "Send" in upper right corner to edit my template

I recieve an error saying "The page you are trying to access is not valid"

This typically occurs on me and my teams first attempt and subsequent attempts appear to work.

Is anyone noticing the same error? Can anyone help please?