Failed create account for two attribute "externalID" and "username"

There is a “400” error during http create operation in CSOD application. There are mandatory attributes that needs to be passed in order to create an account in CSOD application. The problem is passing attribute externalId and username. This attribute value should be unique while creating an account.
The account will create if we pass the static value for externalId and username, however there is an error when we pull the attribute value from sailpoint add pass it in create operation even though the attribute value is unique. Any suggestions?

The first thing i would do is sanitize the data in your screenshot so that it doesn’t include identifiable data for your pilot program.

Second, check that the case of your attribute names are correct. The data shows userName and externalId as the attribute names and the error states UserName and ExternalId.