tumblr connect

Is anyone else using the 'Tumblr Connect' moduel? https://www.drupal.org/project/tumblr_connect

I am struggling to get this up and running. I think I finally have the install correct but, whenever I try to create a Blog entry that should be exported to Tumblr I receive the following message and no entry is created (despite what the message reads):

Tumblr may not be available right now, the system will update Tumblr later.
Blog entry test has been created.