Hello @subrat kumar sahu
Based on the information you have provided, it seems that the issue might be with the response format that the caller function is sending back to the user sign-up flow program. The response format that you have mentioned
{data:{@odata.type:microsoft.graph.onAttributeCollectionSubmitResponseData,actions:[{@odata.type:microsoft.graph.attributeCollectionSubmit.continueWithDefaultBehavior}]}}
seems to be correct. However, it is possible that there might be some other issue with the response that is causing the user sign-up flow program to throw an error.
To further investigate the issue, I would suggest you to check the logs of the user sign-up flow program and see if there are any specific error messages that might give you a clue about the issue.
Additionally, you can also try to test the REST API separately to ensure that it is working as expected. If you are still facing issues, please provide me with more information about the error message that you are seeing in the user sign-up flow program and any other relevant details.