We've recently implemented DocuSign electronic signature functionality into our application. Testing completed successfully and we're able to dispatch documents for signature request using our own DocuSign login / account credentials. One our clients however has reported that they are unable to complete this task using their own login credentials. I have verified that they have entered their DocuSign account details correctly. The $authenticationApi->login call completes successfully but the request to create an envelope fails with the following response:
[401] Error connecting to the API (https://eu.docusign.net/restapi/v2/accounts/11968233/envelopes)
"One or both of Username and Password are invalid."
Any help as to the source of the issue appreciated.
Brian