try to put an error handling on your rest action :
Doing so you should be able to catch the latesthttpresponse object, this object will indicate you the specific error (message and status code)
https://docs.mendix.com/refguide/error-handling-in-microflows/
Hi Aditya,
Hard to tell. Doesn’t look like a rest api problem, but a data source problem in your listView1. Possibly with a microflow as source? First thing to double check: your security. Does Administrator have all the proper rights?