UPDATE: We have reproduced the same problem connecting to EI 6.1.1 business process module
We are trying to implement a application registration (generation of key) for API manager (version 2.1.0), using BPS (version 3.6.0).
For this, we are following the instructions in https://docs.wso2.com/display/AM210/Adding+an+Application+Registration+Workflow
We have also corrected a typo in the content of the package, as provide by the https://github.com/wso2/product-apim/pull/2730/files#diff-737be153055f194110665b96252dcebe
The previous workflow (ApplicationCreation) works fine, but this, when we click in "GenerateKeys" in store, fails with error in BPS, saying that the action urn:approve is invalid
TID: [-1234] [] [2018-06-20 21:11:32,909] DEBUG {org.wso2.carbon.bpel.messagetrace} - Message received: ApplicationRegistrationWorkFlowProcess.{http://workflow.application.apimgt.carbon.wso2.org}initiate {org.wso2.carbon.bpel.messagetrace}
TID: [-1234] [] [2018-06-20 21:11:33,824] WARN {org.apache.axis2.addressing.AddressingFaultsHelper} - triggerActionNotSupportedFault: messageContext: [MessageContext: logID=11ff1a7f886692cdddf6394b6d5e88da06b8bac0e1095ec3] problemAction: urn:approve {org.apache.axis2.addressing.AddressingFaultsHelper}
TID: [-1234] [] [2018-06-20 21:11:33,830] ERROR {org.apache.axis2.engine.AxisEngine} - The [action] cannot be processed at the receiver. {org.apache.axis2.engine.AxisEngine}
org.apache.axis2.AxisFault: The [action] cannot be processed at the receiver.
We have checked, in BPS carbon console, that the service ApplicationRegistrationWorkFlowProcess is deployed, and the WSDL 1.1 endpoint is deployed with soapAction=urn:approve.
The endpoint in API Manager (store), the workflow-extensions in registry /_system/governance/apimgt/applicationdata/workflow-extensions.xml are modified as described to
<SandboxApplicationRegistration executor="org.wso2.carbon.apimgt.impl.workflow.ApplicationRegistrationWSWorkflowExecutor">
<Property name="serviceEndpoint">http://apibps.example.com:9765/services/ApplicationRegistrationWorkFlowProcess/</Property>
<Property name="username">admin</Property>
<Property name="password">admin</Property>
<Property name="callbackURL">https://apimanager.example.com:8243/services/WorkflowCallbackService</Property>
</SandboxApplicationRegistration>
I tested the same with APIM 2.2.0 and BPS 3.6.0 and EI 6.2.0. It worked fine. Can you change the port in callbackURL of SandboxApplicationRegistration in workflow-extensions.xml to 8248 and retry?