Welcome to the Make community!
While I can’t access Dropbox Sign as it’s a paid product, these users have gotten their connections to work:
- @Jason_Jakarta Dropbox Sign URL problem
- @agentur-prozesse.de Re-Process successful scenarios for testing
Also, for quicker assistance with bugs and technical problems, you may want to contact support directly. They respond very quickly and update you frequently on the status of their investigation.
Hope you can share the resolution with us if you manage to solve this problem!