Salesforce integrations stopped working today

Our Salesforce integration stopped working today on its own. When I tried to link our account I get this:

Adobe Sign Authentication Error: unauthorized_client : Please contact Adobe Sign support to make sure your account is ready to use Adobe Sign for Salesforce. Your account tier may not be at the proper level to proceed.

Any ideas as we've been using it for about 14 months without the problems and just renewed our license for another year this past February?