I believe you have not configured onboarding in proper way. Please follow the below steps
1. Login to provisioning account, and enable onboarding.
2. Now enter account id and then select environment, etc.
Note you should see Web services username and password as accountid_ws and accountid$ws.
3. Now open super admin site. I go to service logins and set the data service username and password same as you see in provisioning. And save.
4. Now go to sf_bizx_connection and choose proper instance name and URL.
This way we should create connection between onboarding and bizx instance.
Hope above step will resolve your issue.