How to resolve Azure external Entra Id error "Something went wrong please contact your Administrator

We have a user sign-up flow in Azure external entra Id. In the Sign-up form enduser has to enter his personal details after that he has to click on Next button. On clicking of Next button the event handler Calls one REST API service to create the user in 2 dependent sysstems. In those systems it is cretating the user successfully and the API retuns 200 ok status to the onSubmit event handler. After that the flow returns back to the user sign-up flow. Here the expectation is the Sign-up form should take the user to the next step.But all the time it is throwing error as "Something went wrong please contact your Administrator". The onsubmit event handler has below response code for the User Sign-up flow, which I have written after it is getting HTTPResponse status as Success from the REST API

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