We are in charge of 20 customer websites. Each customer has a separate (own) account. Around July 1st - July 6th, all websites stopped working with Constant Contact. By that I mean websites will no longer provide new email addresses which we get on Newsletter Sign up form and send them to the proper Constant Contact list. When I go on my server to check to log in with the correct credentials I get this message: Unauthorized - This is an authentication problem. Primary reason is that the API call has either not provided a valid API Key, Account Owner Name and Associated Password or the API call attempted to access a resource (URI) which does not match the same as the Account Owner provided in the login credentials. I then went to Constant Contact to log in with the same credentials and they work. I am concluding that something has changed on Constant Contact and knocked down all 20 of my different sites. I need help asap, as I have 20 angry customers. I have tried your main number 866 298 2101, but no matter how long I wait nobody picks up.  Please help! I have found this article which might be related but I am not sure: https://community.constantcontact.com/t5/Developer-Support-ask-questions/V2-API-support-ending-with-Oauth-changes/m-p/391475#M13067 ... View more