HTTP 401 [ISS.0084.9001] Invalid credentials


I have developed WSD provider and set the “ExecuteACL” to anonymous and shared the WSDL URL to SAP team.

SAP team is hitting the webMethods end point from SAP system. Now they are getting the below error.

Invalid content type for SOAP: TEXT/HTML; HTTP 401 [ISS.0084.9001] Invalid Credentials

Can you please let me know how to come across this?