Go to Bizagi Studio, click on the Configuration Tab and then on the Environment settings.
Make sure that Popular settings are selected and choose the proper environment according to your current problem. Then, go directly to the WS-Security options.
Click on the Enable legacy web services (asmx) checkbox and click OK to save changes.
If the problem is related to WS-Security, please verify if the entire configuration for credentials is correct.
For further information please refer to: http://help.bizagi.com/bpm-suite/en/index.html?ws_security.htm