Instead Accept: application/json have you tried to set Content-Type: application/json in HTTP headers tab ? and also have you tested this service in Postman ?
Generally a 403 error means some kind of authentication issue.
I see that you didn’t provide a username or password. Did you provide some other kind of authentication, like a valid bearer token, in your HTTP headers?
Can you share the HTTP headers tab screenshot.
Make sure to pass valid authentication details, Key, value pairs under HTTP headers tab
Yes I received Bearer token on my previous step (POST) and it’s added in HTTP headers (see below)